Twenty-First Army (Japan)

Army · Japan · September 19, 1938 – February 19, 1940

October 1, 1938 – December 1, 1938 5th Division (Imperial Japanese Army) Under this formation at Canton Operation (Wikipedia infobox)
October 1, 1938 – December 1, 1938 18th Division (Imperial Japanese Army) Under this formation at Canton Operation (Wikipedia infobox)
October 1, 1938 – December 1, 1938 104th Division (Imperial Japanese Army) Under this formation at Canton Operation (Wikipedia infobox)

July 25, 1894 – April 17, 1895 First Sino-Japanese War
February 8, 1904 – September 5, 1905 Russo-Japanese War
July 28, 1914 – November 11, 1918 World War I
November 7, 1917 – June 16, 1923 Russian Civil War
July 7, 1937 – September 2, 1945 Second Sino-Japanese War
August 1937 – December 1937 Beiping–Hankou Railway Operation
September 1 – November 9, 1937 Battle of Taiyuan
March 24 – April 7, 1938 Battle of Taierzhuang
July 29 – August 11, 1938 Battle of Lake Khasan
September 1, 1939 – September 2, 1945 World War II
December 8, 1941 Battle of Kota Bharu
December 8, 1941 – January 31, 1942 Malayan campaign
December 11–13, 1941 Battle of Jitra
January 6–8, 1942 Battle of Slim River
January 14, 1942 Battle of Gemas
January 14–22, 1942 Battle of Muar
February 8–15, 1942 Battle of Singapore
February 10–12, 1942 Battle of Bukit Timah
February 13–14, 1942 Battle of Pasir Panjang
December 15, 1942 – January 23, 1943 Battle of Mount Austen, the Galloping Horse, and the Sea Horse
April 17 – December 10, 1944 Operation Ichi-Go