McClellan's missed opportunity at Antietam

A viewer argues that George B. McClellan extracted less from the Army of the Potomac at Antietam than Irvin McDowell did from the less experienced Union army at First Bull Run. The assessment agrees and places McClellan among the most poorly rated generals. The criticism centers on piecemeal deployment and the failure to secure a decisive result despite possessing a copy of Robert E. Lee's operational plan and an early numerical advantage close to two to one. Those advantages did not automatically guarantee victory, but they made the lost opportunity especially serious in this judgment. The watch point therefore focuses on how intelligence and numbers still require timely battlefield command.