The shock of the sudden charge, coupled with the reappearance of the American militiamen on the left flank where Tarleton's exhausted men expected to see their own cavalry, proved too much for the British. Nearly half of the British and Loyalist infantrymen fell to the ground whether they were wounded or not. Their will to fight was gone. Historian Lawrence Babits diagnoses "combat shock" as the cause for this abrupt British collapse—the effects of exhaustion, hunger, and demoralization suddenly catching up with them. Caught in a clever double envelopment that has been compared with the Battle of Cannae in ancient times, many of the British surrendered.