Why did Abraham Lincoln with old troops from general George b McClellan even as he pushed the general to attack?

Abraham Lincoln was frustrated with General George B. McClellan's cautious approach during the Civil War, as he believed decisive action was necessary to defeat the Confederacy. Despite this frustration, Lincoln retained McClellan because he recognized the general's organizational skills and ability to maintain troop morale. Lincoln hoped that by applying pressure for more aggressive tactics, McClellan would be spurred to take the initiative in battle. Ultimately, Lincoln's desire for a successful campaign outweighed his concerns about McClellan's hesitance.