*** Welcome to piglix ***

I Corps (ACW)

I Corps
Icorpsbadge.png
I Corps badge (circle)
Active 1862–1864
Country United States United States of America
Branch Army
Type Army Corps
Size Corps
Engagements American Civil War
Commanders
Notable
commanders
Irvin McDowell
Joseph Hooker
John F. Reynolds 
John Newton
Insignia
1st Division Icorpsbadge1.png
2nd Division Icorpsbadge2.png
3rd Division Icorpsbadge3.png


I Corps (First Corps) was the designation of three different corps-sized units in the Union Army during the American Civil War. Separate formation called the I Corps served in the Army of the Ohio/Army of the Cumberland under Alexander M. McCook from September 29, 1862 to November 5, 1862, in the Army of the Mississippi under George W. Morgan from January 4, 1863 to January 12, 1863, and in the Army of the Potomac and Army of Virginia (see below). The first two were units of very limited life; the third was one of the most distinguished and veteran corps in the entire Union Army, commanded by very distinguished officers. The term "First Corps" is also used to describe the First Veteran Corps from 1864 to 1866.

The I Corps was activated March 13, 1862, when President Abraham Lincoln ordered the creation of a four-corps army, then under the command of Major General George B. McClellan. The first commander of this corps was Major General Irvin McDowell and it contained three divisions. Originally intended to go to the Peninsula Campaign with the rest of the army, it was instead detached and left in the Fredericksburg area after Stonewall Jackson's actions in the Shenandoah Valley caused the Lincoln Administration to fear for Washington's safety. One of its divisions, the Pennsylvania Reserves, was eventually sent to join the main army in June. Temporarily attached to the V Corps, it saw heavy action at Gaines' Mill and Glendale. Division commander Brig. Gen. George McCall and future I Corps commander Brig. Gen. John Reynolds were both captured and freed in a prisoner exchange that August.


...
Wikipedia

...