John Alexander McClernand

Union general; commanded the expedition that captured Arkansas Post.

Dec 18, 1862 – Jan 4, 1863 XIII Corps (Union army) Major general Commander
Jan 4, 1863 – Jan 12, 1863 Army of the Mississippi Major general Commander of the Army of the Mississippi (the second army of that name) for the Arkansas Post expedition
Jan 12, 1863 – Jun 18, 1863 XIII Corps (Union army) Major general Commander; relieved June 18, 1863