Gideon was threshing when God called him (Judges 6:11)

Gideon was called to be a leader during the Period of the Judges.  Israel was being invaded by the Midianites, who came from the east on camels.  To see if God would deliver Israel by his hand, Gideon placed a fleece of wool on the ground.  He asked that there be dew on the fleece, but that the ground would be dry.  This sign occurred and Gideon prepared for battle.  God told him to reduce the number of his men by having them drink from a stream.  Those who drank directly from the stream were sent home and those who scooped water in their hands were kept.  Each warrior was given a trumpet, a jar, and a torch.  At the signal they blew the trumpets and smashed the jars.  Thrown into confusion, the Midianites fled before Gideon's men. After the victory, people asked Gideon to be their ruler, but he refused the honor.

Judg 6:36-40 - Sign of the fleece
Judg 7:1-25 - Victory over Midian