The answer to the crossword for the term 'Loser at Antietam' is LEE, which refers to General Robert E. LEE, who was the commander of the Confederate Army during the Battle of Antietam in 1862. This battle was a major turning point in the American Civil War and resulted in a Union victory, with General LEE's forces suffering heavy losses. As a result, General LEE is often referred to as the 'Loser at Antietam'.