replaces Burnside in command, ii. 146;
question of his powers, 146, 147;
at Gettysburg, 147, 148;
fails to attack, 148, 149;
irritation of Lincoln with, 150-152;
offers to resign, 150;
urged in vain by Lincoln to attack, 168;
"campaign in mud," 169;
enters Petersburg, 334;
at Appomattox, 338.