Joshua 4:11-13

11and when all the people had finished crossing, the ark of the Lord and the priests crossed over in the presence of the people.

12The sons of Reuben and the sons of Gad and half the tribe of Manasseh crossed over armed for battle before the [other] sons of Israel, just as Moses had spoken to them;

13about 40,000 [men] armed and equipped for war crossed for battle before the Lord to the desert plains of Jericho.