Judges 1:3

Judah said unto Simeon As nearest to him, both by relation, being his brother by both parents, and by habitation. Come up with me against the Canaanites Which people, with the Perizzites, still possessed a considerable part of the lot which fell to Judah. And I will likewise go with thee To drive the Canaanites out of that part of the country which was the portion of Simeon. So Simeon went with him They joined their forces together in this expedition, under the conduct, no doubt, of some eminent leader.