Though in command of the Army of Northeastern Virginia in the defeat at First Manasssas/Bull Run in July, 1861, it did not finish off Gen. McDowell, as many considered General Patterson more evidently at fault for not simultaneously advancing upon Johnston in the valley, etc.
From July 25, 1861 Gen. McDowell commanded a division about Washington until promoted to Major general of volunteers in March, 1862 and commanded the Department of the Rappahannock, etc.
In June, 1862 General McDowell was assigned command of the Third Army Corps, and led it at Cedar Mountain, Rappahannock Station and Second Manassas... another crushing defeat.
At the close of 1862, at the general's request, etc. the Army held a Court of Inquiry into the circumstances of his command in the late campaigns; the "McDowell Court of Inquiry" at Washington in January, 1863, etc. It concluded that McDowell had not acted in bad faith, etc. But criticized his decision making in action, noting what it considered an ill-timed absence from his command at critical times...
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Adam Gurowski in Washington circles observed in his journal that the that court of inquiry into McDowell's command, could not make him a good general...despite his staunch self-defense. He had been unfortunate admitted Mr. G., more than most, but if he had been a good general disasters might have been rendered simple defeats... Also observed that had Gen. McDowell come out of Second Bull Run with a wound, even a scratch, he would have come off in better graces. But apparently to have rode off entire from the same battleground twice amidst disaster was quietly considered bad form... No "Rock of Bull Run" moniker for General McDowell.
He was subsequently assigned staff duties and command in the west...