What was the significance of the battle at Antietam Creek?


A. After this battle, McClellan was promoted by Lincoln for pursuing Lee’s beaten troops.

B. The bloodiest single-day battle of the war, this attempt of Lee's to invade the North was thwarted.

C. This was the site of the first ironclad ship battle.

D. This battle was a turning point of the war, showing Britain and France that the Confederates had the clear advantage.