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The Ohio, US Army Department May 3, 1861 - Jan 17, 1865

US Dept. of The Ohio created Ohio Indiana and Illinois transferred from Dept. of the East., May 3, 1861
George B. McClellan Commander, May 3, 1861 - Jul 23, 1861
Western Pennsylvania transferred from US Dept. of Pennsylvania to Dept. of The Ohio, May 9, 1861
Operations in Western Virginia, May 26, 1861 - Sep 15, 1861
Philippi, battle, Jun 3, 1861
Operations to Control Missouri, Jun 5, 1861 - Dec 31, 1861
Missouri transferred fro US Dept. of the West to Dept. of The Ohio, Jun 6, 1861
Booneville, battle, Jun 17, 1861
US Dept. of the West reorganized as Western Dept. including Iowa Minnesota Kansas Nebraska Colorado and Dakota Missouri and Illinois transferred from Dept. of the Ohio Dept. of New Mexico discontinued and absorbed, Jul 3, 1861
Rich Mountain, battle, Jul 11, 1861
William S. Rosecrans Commander, Jul 23, 1861 - Sep 19, 1861
Western Pennsylvania transferred from US Dept. of The Ohio to Dept. of Pennsylvania, Jul 25, 1861
Kesslers Cross Lanes, battle, Aug 26, 1861
Carnifex Ferry, battle, Sep 10, 1861
Cheat Mountain, battle, Sep 12, 1861 - Sep 15, 1861
Area around Cincinnati transferred from US Dept. of the Cumberland to Dept. of the Ohio, Sep 19, 1861
Ormsby M. Mitchel Commander, Sep 19, 1861 - Nov 9, 1861
Greenbrier River, engagement, Oct 3, 1861
Ivy Mountain, engagement, Nov 8, 1861 - Nov 9, 1861
Michigan included in US Dept. of The Ohio, Nov 9, 1861
Don Carlos Buell Commander, Nov 9, 1861 - Mar 11, 1862

Middle Creek, battle, Jan 10, 1862
Mill Springs, battle, Jan 19, 1862
Western Tennessee transferred from US Dept. of the Ohio to Dept. of The Missouri, Feb 6, 1862
US Dept. of The Mississippi created merging Depts. Of Kansas The Missouri and The Ohio, Mar 11, 1862
US Mountain Dept. created parts of Ohio Michigan Kentucky and Tennessee transferred from Dept. of Ohio Western Virginia transferred from Dept. of Western Virginia Dept. of Western Virginia discontinued, Mar 11, 1862
CS Heartland Offensive, Aug 14, 1862 - Oct 24, 1862
US Dept. of the Ohio recreated Indiana Illinois Wisconsin eastern Kentucky western Ohio and western Michigan transferred from Dept. of the Mississippi eastern Ohio and eastern Michigan transferred from Dept. of the Potomac, Aug 19, 1862
Horatio G. Wright Commander, Aug 19, 1862 - Mar 25, 1863
Richmond, battle, Aug 29, 1862 - Aug 30, 1862
US Dept. of The Northwest created Wisconsin transferred from Dept. of the Ohio Minnesota and Iowa transferred from Dept. of the Mississipppi Nebraska and Dakota transferred from Dept. of Kansas, Sep 6, 1862
Munfordville, siege, Sep 14, 1862 - Sep 17, 1862
Munfordville, US surrender, Sep 17, 1862
Perryville, battle, Oct 8, 1862

Western Virginia transferred from US Dept. of the Ohio to Middle Dept., Mar 16, 1863
Ambrose E. Burnside Commander, Mar 25, 1863 - Dec 9, 1863
Columbiana Belmont and Jefferson counties in Ohio transferred from US Dept. of the Ohio to Dept. of the Monongahela, Jun 9, 1863
Corydon, battle, Jul 9, 1863
Buffington Island, battle, Jul 19, 1863
Salineville, battle, Jul 26, 1863
US Division of THE MISSISSIPPI created including Depts. Of The Cumberland The Tennessee and The Ohio, Oct 16, 1863
John G. Foster Commander, Dec 9, 1863 - Jan 28, 1864

Columbiana Belmont and Jefferson counties in Ohio transferred from US Dept. of the Monongahela to Northern Dept., Jan 12, 1864
US Northern Dept. created Michigan Ohio Indiana and Illinois transferred from Dept. of the Ohio, Jan 12, 1864
John M. Schofield Commander, Jan 28, 1864 - Nov 8, 1864
Cynthiana, action, Jun 11, 1864 - Jun 12, 1864
Western Kentucky transferred from US Dept. of The Tennessee to Dept. of the Ohio, Aug 7, 1864
George Stoneman Temp Commander, Nov 8, 1864 - Jan 17, 1865

US Dept. of The Ohio discontinued absorbed by Dept. of the Cumberland, Jan 17, 1865