Judges 6:3, 5, 33

Whenever the Israelites planted any crops, and before they could reap the harvest, the Midianites would come with the Amalekites and other desert tribes and invade the land.

When they invaded the land with their livestock and camels and tents, they were as numerous as locusts, leaving the land desolate.

Now all the Midianites, the Amalekites, and the people of the East formed an army. They crossed the Jordan and camped in the Valley of Jezreel to fight against Israel.