World War I

July 28, 1914 – November 11, 1918 · Western Front — Verdun

Result Allied Powers victory

Global war fought 28 July 1914 – 11 November 1918 between the Allied and Central Powers, killing an estimated 15–22 million people. Triggered by Gavrilo Princip's assassination of Archduke Franz Ferdinand on 28 June 1914, it ended with the 11 November armistice after Kaiser Wilhelm II abdicated; the Treaty of Versailles settled the peace and created the League of Nations.

On the map Overview Contemporaries

Central Powers

Allies

Other

Austria-Hungary

Ottoman Empire

Bulgaria

German Empire

France

United Kingdom

Serbia

Belgium

Italy

United States

Japan

Russian Empire

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Australia

Canada

Sultanate of Egypt

Dominion of Newfoundland

New Zealand

British Raj

Union of South Africa

British Ceylon

Wilhelm II Emperor, Germany

Paul von Hindenburg Commander, German Eighth Army

Erich Ludendorff

Mehmed V Sultan, Ottoman Empire

Mehmed VI Sultan, Ottoman Empire

Franz Joseph I of Austria belligerent leader

Charles I of Austria

Mustafa Kemal Atatürk Commander, Ottoman forces at Gallipoli

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Helmuth von Moltke the Younger Chief of the German General Staff, Germany (1914)

Erich von Falkenhayn Chief of the German General Staff, Germany (1914–1916)

Alexander von Kluck Generaloberst, Commander of the German First Army

Enver Pasha Minister of War, Ottoman Empire; de facto Commander-in-Chief

Franz Conrad von Hötzendorf Field Marshal, Chief of the Austro-Hungarian General Staff

Nicholas II of Russia Emperor, Russia

George V King, United Kingdom

Woodrow Wilson President, United States

Emperor Taishō belligerent leader

Joseph Joffre Marshal of France, Commander-in-Chief of the French Army (1914–1916)

Raymond Poincaré belligerent leader

Georges Clemenceau

David Lloyd George

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Ferdinand Foch

John French Field Marshal, Commander-in-Chief of the British Expeditionary Force (1914–1915)

Robert Nivelle General, Commander of the French Second Army; French Commander-in-Chief (1916–1917)

Philippe Pétain General, Commander at Verdun; French Commander-in-Chief (1917)

Strength and losses

Bulgaria Killed c. 87,500

Ottoman Empire Killed c. 325,000

German Empire Killed c. 1,773,700

Austria-Hungary Killed c. 1,200,000

United States Strength 4,734,991 · Killed 53,402 · Deaths 116,516 · Wounded 204,002

Russian Empire Killed c. 1,700,000

United Kingdom Killed c. 908,371

Japan Killed c. 300

Belgium Killed c. 13,716

France Killed c. 1,385,000

Italy Killed c. 650,000

Killed: c. 8,578,031

Units

Battles and events 221

Key events

Battle of Tannenberg August 26–30, 1914 · German victory
First Battle of the Marne September 5–12, 1914 · Entente victory
Gallipoli campaign February 19, 1915 – January 9, 1916 · Ottoman victory
- Naval operations in the Dardanelles campaign February 19 – March 18, 1915 · Ottoman victory
- Landing at Cape Helles April 25–26, 1915 · Ottoman victory
- Battle of Kumkale April 25, 1915 · Inconclusive
- Battle of Gully Ravine June 28 – July 5, 1915 · Allied victory
- Battle of Sari Bair August 6–21, 1915 · Ottoman victory
- Landing at Suvla Bay August 6–15, 1915 · Ottoman victory
- Battle of Lone Pine August 6–10, 1915 · Allied victory
- Battle of Krithia Vineyard August 6–13, 1915 · Ottoman victory
- Battle of the Nek August 7, 1915 · Ottoman victory
- Battle of Hill 60 (Gallipoli) August 21–29, 1915 · Ottoman victory
- Battle of Scimitar Hill August 21, 1915 · Ottoman victory
Battle of Verdun February 21 – December 18, 1916 · French victory
Battle of Jutland May 31 – June 1, 1916
Battle of the Somme July 1 – November 18, 1916 · Inconclusive
- Battle of Albert (1916) July 1–13, 1916
  - First day on the Somme July 1, 1916
- First day on the Somme July 1, 1916
- Battle of Delville Wood July 14 – September 15, 1916 · British victory
- Battle of Bazentin Ridge July 14–17, 1916 · British victory
- Attack at Fromelles July 19–20, 1916 · German victory
- Fighting for Mouquet Farm August 8–26, 1916 · British victory
- Battle of Guillemont September 3–6, 1916 · British victory
- Battle of Flers–Courcelette September 15–22, 1916 · British victory
- Battle of Thiepval Ridge September 25–28, 1916 · British victory
- Battle of Morval September 25–28, 1916 · Anglo–French victory
- Battle of the Ancre Heights October 1 – November 11, 1916 · British victory
- Battle of Le Transloy October 1–18, 1916 · Indecisive
- Battle of the Ancre November 13–18, 1916 · British victory
Battle of Passchendaele July 31 – November 10, 1917
- Battle of Pilckem Ridge July 31 – August 2, 1917 · Anglo-French victory
- Battle of the Menin Road Ridge September 20–26, 1917 · British victory
- Battle of Polygon Wood September 26–27, 1917 · British victory
- Battle of Poelcappelle October 9, 1917 · Inconclusive
- First Battle of Passchendaele October 12, 1917 · German victory
- Second Battle of Passchendaele October 26 – November 10, 1917 · Allied victory
Battle of Caporetto October 24 – November 19, 1917 · Central Powers victory
Finnish Civil War January 27 – May 15, 1918 · Finnish Whites victory
- Invasion of Åland February 15, 1918 – September 1918 · Germans and Swedes leave Åland
- Battle of Tampere March 8 – April 6, 1918 · Finnish White victory
- Battle of Rautu April 5, 1918 · White victory
- Battle of Helsinki April 13, 1918 · German and White victory
- Battle of Viipuri April 24–29, 1918 · White victory
Treaty of Brest-Litovsk March 3, 1918
German spring offensive March 21 – July 18, 1918
- Operation Michael March 21 – April 5, 1918
- Battle of the Lys (1918) April 9–29, 1918
- Third Battle of the Aisne May 27 – June 6, 1918
Hundred Days Offensive August 8 – November 11, 1918 · Allied victory
- Battle of Mont Saint-Quentin August 31 – September 3, 1918 · Australian Corps victory
- Battle of Havrincourt September 12, 1918 · British victory
- Battle of Épehy September 18, 1918 · Allied victory
- Meuse–Argonne offensive September 26 – November 11, 1918 · Allied victory
- Battle of the Canal du Nord September 27 – October 1, 1918 · Allied victory
- Battle of Courtrai (1918) October 14–19, 1918 · Allied victory

1914 67 events

Sayfo 1914 – 1919
- Defense of Azakh August 18 – November 21, 1915 · Assyrian victory
Serbian campaign of World War I July 28, 1914 – November 24, 1915 · Serbian victory (1914); Central Powers victory (1915); Allied victory (1918)
- Serbian campaign (1914) July 28 – December 15, 1914 · Serbian victory
  - Bombardment of Belgrade (1914) July 28–29, 1914 · Opening of hostilities on the Serbian front
- Battle of Cer August 15–24, 1914 · Serbian victory
- Fall of Belgrade (1915) October 5–16, 1915 · Central Powers victory
- Morava Offensive October 14 – November 9, 1915 · Bulgarian victory
  - Battle of Niš (1915) November 4–5, 1915 · Decisive Bulgarian victory
- Ovče Pole Offensive October 14 – November 15, 1915 · Bulgarian victory
- Battle of Krivolak October 17 – November 21, 1915 · Bulgarian victory
German occupation of Luxembourg during World War I August 1914 – November 11, 1918 · German Victory
Blockade of Germany (1914–1919) August 1914 – July 12, 1919 · Allied victory
Skirmish at Joncherey August 2, 1914 · French victory
East African campaign (World War I) August 3, 1914 – November 25, 1918 · Allied victory
- Battle of Tanga November 2–5, 1914 · German victory
- Battle of Kilimanjaro November 3, 1914 · German victory
- Battle of Latema Nek March 11–12, 1916 · British victory
- Battle of Kahe March 18, 1916 · British victory
- Tabora offensive September 1916 · Allied victory
- Battle of Tabora September 8–19, 1916
- Battle of Behobeho January 3–4, 1917 · Inconclusive
- Battle of Lioma August 31, 1918
African theatre of World War I August 3, 1914 – November 23, 1918 · Allied victory
- East African campaign (World War I) August 3, 1914 – November 25, 1918 · Allied victory
  - Battle of Tanga November 2–5, 1914 · German victory
  - Battle of Kilimanjaro November 3, 1914 · German victory
  - Battle of Latema Nek March 11–12, 1916 · British victory
  - Battle of Kahe March 18, 1916 · British victory
  - Tabora offensive September 1916 · Allied victory
  - Battle of Tabora September 8–19, 1916
  - Battle of Behobeho January 3–4, 1917 · Inconclusive
  - Battle of Lioma August 31, 1918
- Kamerun campaign August 6, 1914 – March 10, 1916 · Allied victory
  - Second Battle of Edea January 5, 1915 · French victory
  - Battle of Gurin April 29, 1915 · British victory
  - Battle of Banjo November 4–6, 1915 · British victory
- Togoland campaign August 9–26, 1914 · Allied victory
- South West Africa campaign September 15, 1914 – July 9, 1915 · Allied victory
  - Maritz rebellion September 15, 1914 – February 4, 1915
  - German campaign in Angola October 1914 – July 9, 1915 · Portuguese victory
  - Battle of Trekkopjes April 26, 1915 · South African victory
  - Battle of Otavi July 1, 1915 · South African victory
Asian and Pacific theatre of World War I August 3, 1914 – January 5, 1919 · Allied victory
- Siege of Tsingtao August 27 – November 7, 1914 · Anglo–Japanese victory
- Occupation of German Samoa August 30, 1914 – 1919 · Allied victory
- Australian occupation of German New Guinea September 1914 – November 1914 · Australian victory
- Battle of Bita Paka September 11, 1914 · Australian victory
- Siege of Toma September 14–17, 1914 · Australian victory
German invasion of Belgium (1914) August 4 – October 31, 1914 · German victory
Pursuit of Goeben and Breslau August 4–10, 1914 · German victory
British declaration of war upon Germany (1914) August 4, 1914
Battle of Liège August 5–16, 1914
Battle of Mulhouse August 7–10, 1914 · German victory
Battle of Lorraine August 14 – September 7, 1914 · German victory
Battle of Antivari August 16, 1914 · Anglo-French victory
Russian invasion of East Prussia (1914) August 17 – September 14, 1914
Battle of Gumbinnen August 20, 1914 · Russian victory
Battle of the Ardennes August 21–23, 1914 · German victory
Battle of Charleroi August 21–23, 1914 · German victory
Sinking of SS Kaiser Wilhelm der Grosse August 22, 1914 · British victory
Battle of Mons August 23, 1914
Battle of Galicia August 23 – September 11, 1914 · Russian victory Full results
Battle of Tannenberg August 26–30, 1914 · German victory
Battle of Le Cateau August 26, 1914 · German victory
Battle of the Trouée de Charmes August 26, 1914 · French victory
Battle of Heligoland Bight (1914) August 28, 1914 · British victory
Battle of Guise August 29–30, 1914 · French victory
Affair of Néry September 1, 1914 · British victory
First Battle of the Marne September 5–12, 1914 · Entente victory
Battle of the Drina September 6 – October 4, 1914 · Inconclusive
First Battle of the Masurian Lakes September 7–14, 1914 · German victory
Fanning Raid September 7, 1914 · German victory
First Battle of the Aisne September 13–28, 1914 · Indecisive
Siege of Przemyśl September 16, 1914 – March 22, 1915 · Russian victoryFull results
Battle of Zanzibar September 20, 1914 · German victory
Action of 22 September 1914 September 22, 1914 · German victory
Bombardment of Papeete September 22, 1914 · German victory
Bombardment of Madras September 22, 1914 · German victory
Battle of Sandfontein September 26, 1914 · German victory
Siege of Antwerp (1914) September 28 – October 10, 1914 · German victory
Battle of the Vistula River September 29 – October 31, 1914 · Russian victory
Battle of Arras (1914) October 1–4, 1914 · Indecisive
Battle of the Rufiji Delta October 1914 – July 11, 1915 · British victory
Battle of Messines (1914) October 12 – November 2, 1914 · Inconclusive
Battle of the Yser October 16–31, 1914 · Allied victory
Battle off Texel October 17, 1914
First Battle of Ypres October 19 – November 22, 1914 · Indecisive
Battle of Penang October 28, 1914 · German victory
Middle Eastern theatre of World War I October 29, 1914 – October 30, 1918 · Allied victory
- Kurdish rebellions during World War I August 1914 – October 1918
- Caucasus campaign November 2, 1914 – October 30, 1918
  - Battle of Sarikamish December 22, 1914 – January 17, 1915 · Russian victory
  - Battle of Ardahan December 25, 1914 – January 18, 1915 · Russian victory
  - Battle of Manzikert (1915) 1915 · Ottoman victory
  - Defense of Van (1915) April 19 – May 17, 1915 · Russo-Armenian victory
  - Battle of Kara Killisse (1915) July 27–31, 1915 · Russian victory
  - Erzurum offensive January 10 – February 16, 1916 · Russian victoryFull results
  - Battle of Koprukoy January 10–19, 1916 · Russian victory
  - Battle of Erzincan July 2–25, 1916 · Russian victory
  - Armistice of Erzincan December 18, 1917
  - Treaty of Brest-Litovsk March 3, 1918
  - Trebizond Peace Conference March 14 – April 14, 1918
  - Battle of Abaran May 21–29, 1918 · Armenian victory
  - Battle of Karakilisa May 25–28, 1918 · Ottoman victory
  - Treaty of Batum June 4, 1918
  - Battle of Goychay July 1, 1918 · Ottoman–Azerbaijani victory
  - German Caucasus expedition October 1918 · Inconclusive
- Mesopotamian campaign November 6, 1914 – November 14, 1918 · Allied victory
  - Fao Landing November 6, 1914 · British victory
  - Battle of Basra (1914) November 11–22, 1914 · British victory
  - Battle of Qurna December 3–9, 1914 · British-Indian victory
  - Battle of Shaiba April 12–14, 1915 · British-Indian victory
  - Battle of Es Sinn September 28, 1915 · British–Indian victory
  - Battle of Ctesiphon (1915) November 22–25, 1915 · Inconclusive
  - Siege of Kut December 7, 1915 – April 29, 1916 · Ottoman victory
  - Battle of Sheikh Sa'ad January 6–8, 1916 · British-Indian victory
  - Battle of Wadi (1916) January 13, 1916 · Ottoman victory
  - Battle of Hanna January 21, 1916 · Ottoman victory
  - Battle of Dujaila March 8, 1916 · Ottoman victory
  - Second Battle of Kut February 23, 1917 · British Empire victory
  - Capture of Baghdad (1917) March 8–11, 1917 · British victory
  - Samarra offensive March 13 – April 23, 1917 · British victory
  - Battles of Ramadi (1917) September 28–29, 1917 · Ottoman victory
  - Battle of Sharqat October 23–30, 1918 · British–Assyrian victory
- South Arabia during World War I November 10, 1914 – June 1916
- Persian campaign (World War I) December 1914 – October 30, 1918 · Allied victory
  - Battle of Dilman April 15, 1915 · Russian coalition victory
  - Battle of Robat Karim December 17, 1915 · Russian victory
  - Kermanshah operation February 1916 – March 1916 · Russian victory
  - Urmia clashes February 9–10, 1918 · Assyrian victory
- Sinai and Palestine campaign January 28, 1915 – October 30, 1918 · Allied victory
  - Stalemate in Southern Palestine April 1917 – October 1917 · Ended with EEF victory at the Battle of Beersheba
  - Battle of Beersheba (1917) October 31, 1917 · Allied victory
  - Battle of Hareira and Sheria November 6–7, 1917 · Egyptian Expeditionary Force victory
  - Battle of Jaffa (1917) December 20–21, 1917 · Allied victory
  - First Battle of Amman March 27–31, 1918 · Ottoman-German victory
  - Battle of Abu Tellul July 14, 1918 · British Empire victory
  - Battle of Megiddo (1918) September 19–25, 1918 · Allied victory
  - Capture of Damascus (1918) September 26 – October 1, 1918 · Allied victory
- Gallipoli campaign February 19, 1915 – January 9, 1916 · Ottoman victory
  - Naval operations in the Dardanelles campaign February 19 – March 18, 1915 · Ottoman victory
  - Landing at Cape Helles April 25–26, 1915 · Ottoman victory
  - Battle of Kumkale April 25, 1915 · Inconclusive
  - Battle of Gully Ravine June 28 – July 5, 1915 · Allied victory
  - Battle of Sari Bair August 6–21, 1915 · Ottoman victory
  - Landing at Suvla Bay August 6–15, 1915 · Ottoman victory
  - Battle of Lone Pine August 6–10, 1915 · Allied victory
  - Battle of Krithia Vineyard August 6–13, 1915 · Ottoman victory
  - Battle of the Nek August 7, 1915 · Ottoman victory
  - Battle of Hill 60 (Gallipoli) August 21–29, 1915 · Ottoman victory
  - Battle of Scimitar Hill August 21, 1915 · Ottoman victory
- Raid on Jifjafa April 11–14, 1916 · British victory
- Battle of Katia April 23, 1916 · Ottoman victory
- Arab Revolt June 10, 1916 – October 25, 1918
  - Siege of Medina June 10, 1916 – January 10, 1919 · Hejazi victory
  - Battle of Mecca (1916) June 10 – July 4, 1916 · Arab victory
  - Battle of Aqaba July 6, 1917 · Arab victory
- Battle of Romani August 3–5, 1916 · British Empire victory
- Battle of Bir el Abd August 9, 1916 · Ottoman victory
- Raid on Bir el Hassana February 21, 1917 · British Empire victory
- Raid on Nekhl February 21, 1917 · British Empire victory
- First Battle of Gaza March 26, 1917 · Central Powers victory
- Second Battle of Gaza April 17–19, 1917 · Central Powers victory
- Southern Palestine offensive October 31 – December 9, 1917 · Allied victory
- Third Battle of Gaza November 1–2, 1917 · Allied victory
- Battle of Tel el Khuweilfe November 1–6, 1917 · British Empire victory
- Battle of Mughar Ridge November 13, 1917 · British Empire victory
- Battle of Nebi Samwil November 18–24, 1917 · British Empire victory
- British occupation of the Jordan Valley February 1918 – September 1918 · British victory
- First Battle of the Jordan April 2, 1918 · Ottoman-German victory
- Battle of Tulkarm September 19, 1918 · British Empire victory
- Battle of Sharon September 19–25, 1918 · Allied victory
- Battle of Nablus (1918) September 19–25, 1918 · Allied victory
- Battle of Arara September 19, 1918 · Franco–British victory
- Battle of Nazareth September 20–21, 1918 · British Empire victory
- Battle of Haifa (1918) September 23, 1918 · British–Indian victory
- Second Battle of Amman September 25, 1918 · Allied victory
- Battle of Samakh September 25, 1918 · Australian Light Horse victory
- Battle of Aleppo (1918) October 25, 1918 · Allied victory
- Charge at Haritan October 26, 1918 · Ottoman victory
Battle of Kraków (1914) October 31 – November 15, 1914 · Indecisive
Battle of Coronel November 1, 1914 · German victory
Caucasus campaign November 2, 1914 – October 30, 1918
- Battle of Sarikamish December 22, 1914 – January 17, 1915 · Russian victory
- Battle of Ardahan December 25, 1914 – January 18, 1915 · Russian victory
- Battle of Manzikert (1915) 1915 · Ottoman victory
- Defense of Van (1915) April 19 – May 17, 1915 · Russo-Armenian victory
- Battle of Kara Killisse (1915) July 27–31, 1915 · Russian victory
- Erzurum offensive January 10 – February 16, 1916 · Russian victoryFull results
- Battle of Koprukoy January 10–19, 1916 · Russian victory
- Battle of Erzincan July 2–25, 1916 · Russian victory
- Armistice of Erzincan December 18, 1917
- Treaty of Brest-Litovsk March 3, 1918
- Trebizond Peace Conference March 14 – April 14, 1918
- Battle of Abaran May 21–29, 1918 · Armenian victory
- Battle of Karakilisa May 25–28, 1918 · Ottoman victory
- Treaty of Batum June 4, 1918
- Battle of Goychay July 1, 1918 · Ottoman–Azerbaijani victory
- German Caucasus expedition October 1918 · Inconclusive
Battle of Tanga November 2–5, 1914 · German victory
Bergmann Offensive November 2–17, 1914 · Ottoman victory
Raid on Yarmouth November 3, 1914 · Inconclusive
Battle of Cocos November 9, 1914 · Australian victory
Battle of Łódź (1914) November 11 – December 6, 1914
Battle of Kolubara November 16 – December 15, 1914 · Serbian victory
Battle of Cape Sarych November 18, 1914 · Russian victory
Battle of Limanowa December 1–13, 1914 · Central Powers victory
Carpathian Campaign December 1914 – March 1915 · Russian victory
Battle of the Falkland Islands December 8, 1914 · British victory
Raid on Scarborough, Hartlepool and Whitby December 16, 1914 · German victory
Battle of Sarikamish December 22, 1914 – January 17, 1915 · Russian victory
Winter operations 1914–1915 December 22, 1914 · Inconclusive
Battle of Łowczówek December 22–25, 1914 · Inconclusive
Raid on Cuxhaven December 25, 1914

1915 44 events

Otranto Barrage 1915 – 1918
Chilembwe uprising January 1915 · Rebellion suppressed
Battle of Jarrab January 17, 1915 · Jabal Shammar victory
Battle of Jassin January 18–19, 1915 · German victory
Battle of Dogger Bank (1915) January 24, 1915 · British victory
Raid on the Suez Canal January 26 – February 4, 1915 · British victory
Battle of Humin-Bolimów January 31, 1915 · Inconclusive
Second Battle of the Masurian Lakes February 7–22, 1915 · German victory
Gallipoli campaign February 19, 1915 – January 9, 1916 · Ottoman victory
- Naval operations in the Dardanelles campaign February 19 – March 18, 1915 · Ottoman victory
- Landing at Cape Helles April 25–26, 1915 · Ottoman victory
- Battle of Kumkale April 25, 1915 · Inconclusive
- Battle of Gully Ravine June 28 – July 5, 1915 · Allied victory
- Battle of Sari Bair August 6–21, 1915 · Ottoman victory
- Landing at Suvla Bay August 6–15, 1915 · Ottoman victory
- Battle of Lone Pine August 6–10, 1915 · Allied victory
- Battle of Krithia Vineyard August 6–13, 1915 · Ottoman victory
- Battle of the Nek August 7, 1915 · Ottoman victory
- Battle of Hill 60 (Gallipoli) August 21–29, 1915 · Ottoman victory
- Battle of Scimitar Hill August 21, 1915 · Ottoman victory
Battle of Neuve Chapelle March 10–13, 1915
Battle of Más a Tierra March 14, 1915 · British victory
Second Battle of Ypres April 22 – May 25, 1915
Landing at Cape Helles April 25–26, 1915 · Ottoman victory
Landing at Anzac Cove April 25 – May 3, 1915
Treaty of London (1915) April 26, 1915
First Battle of Krithia April 28, 1915 · Ottoman victory
Action off Noordhinder Bank May 1, 1915
Gorlice–Tarnów offensive May 2 – June 22, 1915 · Central Powers victory
Second Battle of Krithia May 6–8, 1915 · Ottoman victory
Sinking of the RMS Lusitania May 7, 1915
Action of 10 May 1915 May 10, 1915 · Indecisive
Bombardment of Ancona May 23–24, 1915 · Austro-Hungarian victory
Battle of Festubert May 27, 1915 · German victory
Bussa rebellion June 1915 · British victory
Third Battle of Krithia June 4, 1915 · Ottoman victory
Battle of Bukoba June 21–23, 1915 · British victory
First Battle of the Isonzo June 23 – July 7, 1915 · Limited Italian advance
Battle of Bitlis July 1915 – August 1916 · Russian victory
Battle of Gotland July 2, 1915 · Anglo-Russian victory
Vistula–Bug offensive July 13 – August 28, 1915 · Central Powers’ victory
Battle of Sari Bair August 6–21, 1915 · Ottoman victory
Landing at Suvla Bay August 6–15, 1915 · Ottoman victory
Battle of the Gulf of Riga August 8–19, 1915 · Entente victory
Great Retreat (Russia) August 17 – September 19, 1915 · Central Powers victory
Baralong incidents September 24, 1915
Second Battle of Champagne September 25 – November 6, 1915 · German victory
Third Battle of Artois September 25 – November 4, 1915
Macedonian front October 21, 1915 – September 30, 1918 · Allied victory
- Battle of Doiran (1916) August 9–18, 1916 · Bulgarian victory
- Battle of Florina August 17–28, 1916 · The Bulgarians capture Florina
- Struma operation August 17–23, 1916
- Monastir offensive September 12 – December 11, 1916 · Allied Powers victory
  - Battle of Malka Nidzhe September 12–14, 1916 · Entente victory
- Battle of Kaymakchalan September 12–30, 1916 · Serbian victory
- Battle of the Crna Bend (1916) October 1916 – November 1916 · Entente victory
- Battle of Monastir (1917) March 12 – May 26, 1917 · Central Powers victory
- Battle of Doiran (1917) April 22 – May 8, 1917 · Bulgarian victory
- Battle of the Crna Bend (1917) May 5–9, 1917 · Central Powers victory
- Vardar offensive September 15–29, 1918 · Allied victory
- Battle of Doiran (1918) September 18–19, 1918 · Bulgarian victory
Volta-Bani War November 1915 – February 1917 · French victory
Battle of Ctesiphon (1915) November 22–25, 1915 · Inconclusive
Great Retreat (Serbia) November 25, 1915 – January 18, 1916
Siege of Kut December 7, 1915 – April 29, 1916 · Ottoman victory
Battle of Robat Karim December 17, 1915 · Russian victory
Battle of Durazzo (1915) December 28–29, 1915 · Allied victory

1916 31 events

Basmachi movement 1916 – 1934
- Siege of Khiva (1924) January 19–24, 1924 · Red Army victory
Kaocen revolt 1916 – 1917 · French victory
Montenegrin campaign January 5–17, 1916
Battle of Mojkovac January 6–7, 1916 · Montenegrin victory
Erzurum offensive January 10 – February 16, 1916 · Russian victoryFull results
Trebizond Campaign February 5 – April 15, 1916 · Russian victory
Battle of Dogger Bank (1916) February 10, 1916
Battle of Salaita Hill February 12, 1916 · German victory
Battle of Verdun February 21 – December 18, 1916 · French victory
Action of 29 February 1916 February 29, 1916 · British victory
Invasion of Darfur (1916) March 16 – November 6, 1916 · Anglo-Egyptian victory
Lake Naroch offensive March 18 – April 14, 1916 · German victory
Bombardment of Yarmouth and Lowestoft April 24, 1916 · Inconclusive
Gas attacks at Hulluch April 27–29, 1916 · British victory
Battle of Asiago May 15 – June 10, 1916 · Italian victory (counter-offensive phase)
Sykes–Picot Agreement May 16, 1916
Battle of Jutland May 31 – June 1, 1916
Brusilov Offensive June 4 – September 20, 1916 · Russian victoryFull results
- Battle of Lutsk June 6, 1916 · Russian victory
- Battle of Kowel July 24 – August 8, 1916 · Central Powers victory
Battle of the Somme July 1 – November 18, 1916 · Inconclusive
- Battle of Albert (1916) July 1–13, 1916
  - First day on the Somme July 1, 1916
- First day on the Somme July 1, 1916
- Battle of Delville Wood July 14 – September 15, 1916 · British victory
- Battle of Bazentin Ridge July 14–17, 1916 · British victory
- Attack at Fromelles July 19–20, 1916 · German victory
- Fighting for Mouquet Farm August 8–26, 1916 · British victory
- Battle of Guillemont September 3–6, 1916 · British victory
- Battle of Flers–Courcelette September 15–22, 1916 · British victory
- Battle of Thiepval Ridge September 25–28, 1916 · British victory
- Battle of Morval September 25–28, 1916 · Anglo–French victory
- Battle of the Ancre Heights October 1 – November 11, 1916 · British victory
- Battle of Le Transloy October 1–18, 1916 · Indecisive
- Battle of the Ancre November 13–18, 1916 · British victory
Battle of Erzincan July 2–25, 1916 · Russian victory
Battle of Kostiuchnówka July 4–6, 1916 · Inconclusive
Battle of Pozières July 23 – August 7, 1916 · Allied victory
Battle of Romani August 3–5, 1916 · British Empire victory
Battle of Gorizia (1916) August 6–17, 1916 · Italian victory
Action of 19 August 1916 August 19, 1916 · Indecisive
Battle of Transylvania August 27 – November 26, 1916 · Central Powers victory Full results
Battle of Ginchy September 9, 1916 · British victory
Battle of Dover Strait (1916) October 26–27, 1916
Battle of Bucharest November 25 – December 3, 1916 · Central Powers victory
Noemvriana December 1, 1916
Battle of Magdhaba December 23, 1916 · British victory

1917 37 events

Sixtus Affair 1917 – January 1, 1918
Christmas Battles January 5–11, 1917 · Russian victory
Battle of Rafa January 9, 1917 · British victory
Zimmermann Telegram January 16 – March 1, 1917
Action of 16 March 1917 March 16, 1917 · British victory
Operation Alberich March 20, 1917 · German success
First Battle of Gaza March 26, 1917 · Central Powers victory
United States declaration of war on Germany (1917) April 6, 1917
Battle of Vimy Ridge April 9–12, 1917 · British Empire victory
Battle of Arras (1917) April 9 – May 16, 1917
Nivelle offensive April 16 – May 9, 1917 · Indecisive
Battle of Dover Strait (1917) April 20, 1917 · British victory
Action of 4 May 1917 May 4, 1917 · Indecisive
Battle of the Strait of Otranto (1917) May 14–15, 1917
Operation Hush June 1917 – October 1917 · Cancelled
Battle of Messines (1917) June 7–14, 1917 · British victory
Battle of Mount Ortigara June 10–25, 1917 · Austro-Hungarian victory
Kerensky offensive July 1–19, 1917 · Central Powers victory
- Battle of Zborov (1917) July 1–2, 1917 · Czechoslovak and Russian victory
Battle of Passchendaele July 31 – November 10, 1917
- Battle of Pilckem Ridge July 31 – August 2, 1917 · Anglo-French victory
- Battle of the Menin Road Ridge September 20–26, 1917 · British victory
- Battle of Polygon Wood September 26–27, 1917 · British victory
- Battle of Poelcappelle October 9, 1917 · Inconclusive
- First Battle of Passchendaele October 12, 1917 · German victory
- Second Battle of Passchendaele October 26 – November 10, 1917 · Allied victory
Battle of Hill 70 August 15–25, 1917 · Allied victory
Eleventh Battle of the Isonzo August 18 – September 12, 1917 · Italian tactical victory
Riga offensive (1917) September 1–3, 1917 · German victory
Operation Albion September 29 – October 20, 1917 · German victory
Battle of Mahiwa October 15–18, 1917 · Indecisive
Action off Lerwick October 17, 1917 · German victory
Battle of Moon Sound October 19 – November 3, 1917 · German victory
Battle of Caporetto October 24 – November 19, 1917 · Central Powers victory
Battle of Beersheba (1917) October 31, 1917 · Allied victory
Third Battle of Gaza November 1–2, 1917 · Allied victory
Battle of Jerusalem (1917) November 17 – December 30, 1917 · Allied victoryEnd of the Ottoman rule in Jerusalem and Palestine
Second Battle of Heligoland Bight November 17, 1917 · Indecisive
Battle of Cambrai (1917) November 20 – December 7, 1917
Battle of Ngomano November 25, 1917 · German victory
United States declaration of war on Austria-Hungary December 7, 1917
Armistice of Focșani December 9, 1917
Action of 11–12 December 1917 December 12, 1917 · German victory
Armistice between Russia and the Central Powers December 15, 1917

1918 42 events

Finnish Civil War January 27 – May 15, 1918 · Finnish Whites victory
- Invasion of Åland February 15, 1918 – September 1918 · Germans and Swedes leave Åland
- Battle of Tampere March 8 – April 6, 1918 · Finnish White victory
- Battle of Rautu April 5, 1918 · White victory
- Battle of Helsinki April 13, 1918 · German and White victory
- Battle of Viipuri April 24–29, 1918 · White victory
Ice Cruise of the Baltic Fleet February 1918 – May 1918 · Transfer of the Baltic Fleet to Soviet-controlled harbours.
Treaty of Brest-Litovsk (Ukraine–Central Powers) February 9, 1918
Bakar mockery February 10, 1918 · Italian propaganda victory
Battle of Rarańcza February 15–16, 1918 · Polish victory
Operation Faustschlag February 18 – March 3, 1918 · Central Powers victory
Treaty of Brest-Litovsk March 3, 1918
Operation Michael March 21 – April 5, 1918
German spring offensive March 21 – July 18, 1918
- Operation Michael March 21 – April 5, 1918
- Battle of the Lys (1918) April 9–29, 1918
- Third Battle of the Aisne May 27 – June 6, 1918
Armenian–Azerbaijani war (1918–1920) March 30, 1918 – November 28, 1920 · Inconclusive; Soviet invasion of Armenia and Azerbaijan and subsequent Soviet victory
- Soviet invasion of Azerbaijan 1920 · Soviet victory
- Shusha massacre March 1920
- Soviet invasion of Armenia September 24 – November 29, 1920 · Soviet victory
Battle of Moreuil Wood March 30, 1918
Battle of the Lys (1918) April 9–29, 1918
Zeebrugge Raid April 23, 1918 · German victory
- First Ostend Raid April 23–24, 1918 · German victory
Second Battle of Villers-Bretonneux April 24–27, 1918 · Allied victory
Second Battle of the Jordan April 30 – May 4, 1918 · Ottoman victory
Treaty of Bucharest (1918) May 7, 1918
Second Ostend Raid May 9, 1918 · German victory
Battle of Kaniów May 10–11, 1918 · German victory
Battle of Sardarabad May 22–29, 1918 · Armenian victory
Third Battle of the Aisne May 27 – June 6, 1918
Battle of Cantigny May 28, 1918 · Allied victory
Battle of Skra-di-Legen May 29–31, 1918 · Allied victory
Battle of Belleau Wood June 1–26, 1918 · Allied victory
Second Battle of the Piave River June 15–23, 1918 · Italian victory
Sochi conflict July 1918 · Inconclusive
Battle of Hamel July 4, 1918 · Allied victory
Second Battle of the Marne July 15 – August 6, 1918 · Entente victory
Battle of Château-Thierry (1918) July 18, 1918 · Allied victory
Battle of Amiens (1918) August 8–12, 1918 · Allied victory
Hundred Days Offensive August 8 – November 11, 1918 · Allied victory
- Battle of Mont Saint-Quentin August 31 – September 3, 1918 · Australian Corps victory
- Battle of Havrincourt September 12, 1918 · British victory
- Battle of Épehy September 18, 1918 · Allied victory
- Meuse–Argonne offensive September 26 – November 11, 1918 · Allied victory
- Battle of the Canal du Nord September 27 – October 1, 1918 · Allied victory
- Battle of Courtrai (1918) October 14–19, 1918 · Allied victory
Battle of San Matteo August 13 – September 3, 1918 · Italian victory (13 August)
Battle of Baku August 26 – September 14, 1918 · Central Powers victory
Battle of Saint-Mihiel September 12–15, 1918 · Allied victory
Battle of Dobro Pole September 15, 1918 · Allied victory
Battle of Megiddo (1918) September 19–25, 1918 · Allied victory
Meuse–Argonne offensive September 26 – November 11, 1918 · Allied victory
Battle of Jisr Benat Yakub September 27, 1918 · Allied victory
Battle of the St Quentin Canal September 29 – October 2, 1918 · Allied victory
Battle of Cambrai (1918) October 8–10, 1918 · Allied victory
Battle of Sharqat October 23–30, 1918 · British–Assyrian victory
Battle of Vittorio Veneto October 24 – November 3, 1918 · Italian victory
Battle of the Sambre (1918) November 4, 1918 · Allied victory