Supporting A Brother in War

Judges 1:16-18
 
16  And the children of the Kenite, Moses' father in law, went up out of the city of palm trees with the children of Judah into the wilderness of Judah, which lieth in the south of Arad; and they went and dwelt among the people. 
17  And Judah went with Simeon his brother, and they slew the Canaanites that inhabited Zephath, and utterly destroyed it. And the name of the city was called Hormah. 
18  Also Judah took Gaza with the coast thereof, and Askelon with the coast thereof, and Ekron with the coast thereof.