At that time I commanded you: “The LORD your God has given you this land to possess. All your men of valor are to cross over, armed for battle, ahead of your brothers, the Israelites.
Moses commanded the tribes who received this land to cross over armed for battle ahead of their fellow Israelites.
It turns possession into obligation.
12So at that time we took possession of this land. To the Reubenites and Gadites I gave the land beyond Aroer along the Arnon Valley, and half the hill country of Gilead, along with its cities. 13To the half-tribe of Manasseh I gave the rest of Gilead and all of Bashan, the kingdom of Og. (The entire region of Argob, the whole territory of Bashan, used to be called the land of the Rephaim.) 14Jair, a descendant of Manasseh, took the whole region of Argob as far as the border of the Geshurites and Maacathites. He renamed Bashan after himself, Havvoth-jair, by which it is called to this day. 15To Machir I gave Gilead, 16and to the Reubenites and Gadites I gave the territory from Gilead to the Arnon Valley (the middle of the valley was the border) and up to the Jabbok River, the border of the Ammonites. 17The Jordan River in the Arabah bordered it from Chinnereth to the Sea of the Arabah (the Salt Sea) with the slopes of Pisgah to the east. 18At that time I commanded you: “The LORD your God has given you this land to possess. All your men of valor are to cross over, armed for battle, ahead of your brothers, the Israelites. 19But your wives, your children, and your livestock— I know that you have much livestock— may remain in the cities I have given you, 20until the LORD gives rest to your brothers as He has to you, and they too have taken possession of the land that the LORD your God is giving them across the Jordan. Then each of you may return to the possession I have given you.” 21And at that time I commanded Joshua: “Your own eyes have seen all that the LORD your God has done to these two kings. The LORD will do the same to all the kingdoms you are about to enter. 22Do not be afraid of them, for the LORD your God Himself will fight for you.”