Commentaries
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.
12, 13. the children of Reuben … passed over armed before the children of Israel—There is no precedency to the other tribes indicated here; for there is no reason to suppose that the usual order of march was departed from; but these are honorably mentioned to show that, in pursuance of their promise (Jos 1:16-18), they had sent a complement of fighting men to accompany their brethren in the war of invasion.