With what did Shamgar son of Anath strike down 600 Philistines?

Answer: An oxgoad

After Ehud came Shamgar, who also saved Israel, striking down six hundred Philistines with an oxgoad.

“After Ehud came Shamgar son of Anath. And he too saved Israel, striking down six hundred Philistines with an oxgoad.”— Judges 3:31 (BSB)