In Joel 3:10, what are the nations told to beat their plowshares into?

Answer: Swords

Calling the nations to war, Joel says, "Beat your plowshares into swords and your pruning hooks into spears," the reverse of Isaiah 2:4.

“Proclaim this among the nations: “Prepare for war; rouse the mighty men; let all the men of war advance and attack! Beat your plowshares into swords and your pruning hooks into spears. Let the weak say, ‘I am strong!’”— Joel 3:9-10 (BSB)