Then Joshua called the Reubenites, etc. - We have already seen that 40,000 men of the tribes of Reuben and Gad, and the half tribe of Manasseh, had passed over Jordan armed, with their brethren, according to their stipulation with Moses. The war being now concluded, Joshua assembles these warriors, and with commendations for their services and fidelity, he dismisses them, having first given them the most pious and suitable advices. They had now been about seven years absent from their respective families; and though there was only the river Jordan between the camp at Gilgal and their own inheritance, yet it does not appear that they had during that time ever revisited their own home, which they might have done any time in the year, the harvest excepted, as at all other times that river was easily fordable.

Then Joshua called the Reubenites, and the Gadites, and the half tribe of Manasseh. The promise of God to Israel being fulfilled, the land of Canaan being for the most part subdued, the war at an end, and rest had on all sides from their enemies, and the land divided among the nine tribes and an half, and they settled in the quiet possession of their lots; Joshua sent for the two tribes of Reuben and Gad, and the half tribe of Manasseh, who had, at their own request, their portion allotted them on the other side Jordan, and who came over that river with him to assist their brethren in their wars with the Canaanites, and addressed them in the following respectable manner.
Then Joshua called the Reubenites, and the Gadites, and the half tribe of Manasseh. The promise of God to Israel being fulfilled, the land of Canaan being for the most part subdued, the war at an end, and rest had on all sides from their enemies, and the land divided among the nine tribes and an half, and they settled in the quiet possession of their lots; Joshua sent for the two tribes of Reuben and Gad, and the half tribe of Manasseh, who had, at their own request, their portion allotted them on the other side Jordan, and who came over that river with him to assist their brethren in their wars with the Canaanites, and addressed them in the following respectable manner.
Joshua 22:2

jos 22:2
jos 22:2
jos 22:2And said unto them, ye have kept all that Moses the servant of the Lord commanded you,.... Which was, that they should leave their wives and children, and flocks, and herds, behind them in the land of Gilead, and pass over Jordan, with their brethren the children of Israel armed, and fight with them, and for them, until the Canaanites were subdued, and not return until their brethren were peaceably settled in the possession of their inheritances; all which they had punctually observed, and inviolably kept, as they agreed to, Num 32:1,

and have obeyed my voice in all that I commanded you; as the generalissimo and commander in chief of the Israelitish forces; as what rank and position to be in, what part to take in an engagement, what attack to make, when and where, or on what expedition to go; wherever he ordered them to go, they went; and upon whatsoever and wheresoever he sent them, they readily and cheerfully obeyed, as they promised, Jos 1:16; and approved themselves as good soldiers under him; for all which he commends them, and gives them military honour.