And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed. But Moses hands were heavy; and they took a stone, and put it under him, and he sat thereon; and Aaron and Hur stayed up his hands. 17:11

Trivia: In Exodus 17, there is a battle between the Israelites and the Amalekites. During the battle, what happened when Moses put his hand down?