The result again did not reward him. His choice of Burnside was a mistake. There were corps commanders under McClellan who had earned special confidence, but they were all rather old. General Burnside, who was the senior among the rest, had lately succeeded in operations in connection with the Navy on the North Carolina coast, whereby certain harbours were permanently closed to the South. He had since served under McClellan at the Antietam, but had not earned much credit. He was a loyal friend to McClellan and very modest about his own capacity. Perhaps both these things prejudiced Lincoln in his favour. He continued in active service till nearly the end of the war, when a failure led to his retirement; and he was always popular and respected. At this juncture he failed disastrously. On December 11 and 12, 1862, Lee's army lay strongly posted on the south of the Rappahannock. Burnside, in spite, as it appears, of express warnings from Lincoln, attacked Lee at precisely the point, near the town of Fredericksburg, where his position was really impregnable. The defeat of the Northern army was bloody and overwhelming. Burnside's army became all but mutinous; his corps commanders, especially General Hooker, were loud in complaint. He was tempted to persist, in spite of all protests, in some further effort of rashness. Lincoln endeavoured to restrain him. Halleck, whom Lincoln begged to give a definite military opinion, upholding or overriding Burnside's, had nothing more useful to offer than his own resignation. After discussions and recriminations among all officers concerned, Burnside offered his resignation. Lincoln was by no means disposed to remove a general upon a first failure or to side with his subordinates against him, and refused to accept it. Burnside then offered the impossible alternative of the dismissal of all his corps commanders for disaffection to him, and on January 25, 1863, his resignation was accepted.