Joshua 4:13

About forty thousand. At the last census (Numbers 26) the men eligible for military service numbered: Reuben, 43,730 (verse 7); Gad, 40,500 (verse 18); Manasseh, 52,700 (verse 34), or, for the exact half, 26,350. Thus the entire force of the two and a half tribes was about 110,580. They therefore left more than half their number to protect their families and their dwellings. This was not inconsistent with the spirit of their agreement with Moses.

Prepared for war. In Joshua 1:14 this expression is translated “armed,” literally “an army in five parts.” The phrase, “prepared for war,” is from a word meaning “stripped” or “equipped for war.”