Whom did God call to deliver Israel from the Midianites?

Answer: Gideon

The LORD told Gideon, "Go in the strength you have and save Israel from the hand of Midian. Am I not sending you?"

“Then the angel of the LORD came and sat down under the oak in Ophrah that belonged to Joash the Abiezrite, where his son Gideon was threshing wheat in a winepress to hide it from the Midianites.”— Judges 6:11 (BSB)