The obverse depicts Robert E. Lee and George McClellan, and the reverse shows Burnside's Bridge.
Similar to the Delaware Tercentenary half dollar, the reason for minting the commemorative was by the historical significance of the coin's subject rather than for profit as was the case with many contemporary commemorative coins.
Both Washington County Historical Society of Hagerstown, Maryland, as well as the Antietam Celebration Commission had called for the minting of a commemorative coin to mark 75th anniversary of the Battle of Antietam.
Additionally, taking into consideration the abuses perpetrated by previous commemorative coin programs, this legislation specifically required for the coins to be struck with a single design and at a single mint.
[1] Sculptor William Marks Simpson was hired to design the coin.