12 The armed warriors from the tribes of Reuben, Gad, and the half-tribe of Manasseh led the Israelites across the Jordan, just as Moses had directed. 13 These armed men-about 40,000 strong-were ready for battle, and the Lord was with them as they crossed over to the plains of Jericho.
Matthew Henry's Commentary on Joshua 4:12-13
Commentary on Joshua 4:10-19
(Read Joshua 4:10-19)
The priests with the ark did not stir till ordered to move. Let none be weary of waiting, while they have the tokens of God's presence with them, even the ark of the covenant, though it be in the depths of adversity. Notice is taken of the honour put upon Joshua. Those are feared in the best manner, and to the best purpose, who make it appear that God is with them, and that they set him before them.