As a general,what was George McClellan's biggest contribution to the Union's ultimate victory?

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George McClellan's biggest contribution was his ability to mold the Army of the Potomac into an effective fighting force. He created a well-trained and well-equipped army, which was key to the Union's victory. However, he did not lead the Union to a major victory at Gettysburg, as that was under the leadership of General Meade. He also did not devise a good strategy to win at Vicksburg, which was under the leadership of General Grant. While he did limit the amount of troops used during battles, this was not his biggest contribution. Finally, while he did size up Confederate forces before battles, this was not unique to him and was a common practice among all generals.

As a General,what Was George McClellan's Biggest Contribution to the Union's