 When Ulysses S. Grant became general-in-chief, he discussed returning McClellan to an unspecified position.But all of these opportunities were impossible, given the opposition within the administration and the knowledge that McClellan posed a potential political threat.McClellan worked for months on a lengthy report describing his two major campaigns and his successes in organizing the Army, replying to his critics and justifying his actions by accusing the administration of undercutting him and denying him necessary reinforcements.