Despite his complete lack of military experience at the outbreak of the Civil War, Wadsworth was commissioned a
major general in the
New York state militia in May 1861. He served as a civilian volunteer
aide-de-camp to
Maj. Gen. Irvin McDowell at the
First Battle of Bull Run on July 8. McDowell recommended him for command and, on August 9, Wadsworth was commissioned a
brigadier general; on October 3 he received command of the 2nd
Brigade in McDowell's
Division of the
Army of the Potomac. He then led the 2nd Brigade, 3rd Division, of the
I Corps of the army until March 17. From March 17 to September 7, 1862, Wadsworth commanded the Military District of
Washington. Wadsworth was mortally wounded on May 6, trying to turn his two intact brigades (his other brigade had collided with the Federal units on his left and lost cohesion) when he was shot in the head. Wadsworth fell from his horse. Passing Confederate soldiers looted his body of any valuables--John Belote of the 6th Virginia got Wadsworth's pocket watch, which he returned to the general's widow after the war. Eventually the stricken Wadsworth was taken to a Confederate field hospital but there was not much to be done for him. The bullet entered the top left of his head. Wadsworth was still alive and seen to play with a couple of muskets used to construct a makeshift litter but he did not appear to be aware of his surroundings and attempts to give him food were unsuccessful. He died on the afternoon of May 8. George Meade sent a letter to Robert E. Lee under a flag of truce requesting the return of the body but Lee replied that that was impossible with an active campaign going on. While the high command of the two armies continued to bicker back and forth, the enlisted men came to an agreement on their own initiative. Wadsworth's body was handed over by Confederate troops on May 12 well before Meade or Lee knew about it. Wadsworth's son-in-law, Montgomery Harrison Ritchie, went into the Confederate camp to retrieve his body. The day before he was wounded, he was promoted to
major general, but this appointment was withdrawn and he received instead a posthumous
brevet promotion to major general as of May 6, 1864, for his service at Gettysburg and the Wilderness. Wadsworth's remains were brought back to Geneseo, New York, and buried there in Temple Hill Cemetery. ==Legacy==