No.
McClellan was Commander of the Department of the Ohio, Commander of the Department of the East before being promoted to General in Chief and Commander of the Army of the Potomac.
He was replaced as Commander of the Department of the Ohio by Ormsby M. Mitchel. He was replaced as Commander of the East and General in Cheif by Henry Halleck and replaced as Commander of the Army of the Potomac by Ambrose E. Burnside.
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They were all senior Union Generals. Apart from that, nothing much. Scott, Halleck and Grant all occupied the post of General-in-Chief. McClellan and Burnside both commanded the Army of the Potomac.
George McClellan, Ambrose Burnside,George McClellan(again), Joseph Hooker,George Meade, Ulysses Grant.
Antietam
General Grant
McClellan was a Union commander and he repelled general Lee's first Northern invasion.