Judges 7:8

So the people took victuals in their hand, and their trumpets: and he sent all the rest of Israel every man unto his tent, and retained those three hundred men: and the host of Midian was beneath him in the valley.

Cross-reference

Judges 7:19 shows Gideon's men blowing trumpets and smashing jars—the trumpets from 7:8 are used in the attack.

Judges 6:33 describes the Midianite coalition encamped in the valley—this is the very enemy Gideon faces in 7:8.

Judges 3:27 shows Ehud using a trumpet to rally Israel for battle — the same signal Gideon's 300 used, linking two military trumpet calls.

Numbers 10:9 commands trumpets in war as a memorial before God—Gideon's trumpets echo this divinely ordained battle practice.

1 Kings 20:27 depicts Israel outnumbered and provisioned like Gideon's small army—similar theme of God using the few.