Judges 11:21

21 And the Lord betook Sihon with all his host into the hands of Israel; and Israel smote him, and had in possession all the land of Amorites, the dweller(s) of that country, (And the Lord delivered Sihon with all his army into the hands of Israel; and Israel struck them down, and had in possession all the land of the Amorites, the inhabitants of that country,)

Judges 11:21 Meaning and Commentary

Judges 11:21

And the Lord God of Israel delivered Sihon and all his people
into the hand of Israel
So that as Sihon, his people, and his country, fell into the hands of Israel through the victory the Lord gave them over him, they had a divine right to the land now in dispute:

and they smote them:
destroyed him and all his people, as they were ordered to destroy the seven nations of Canaan, of which the Amorites were one, ( Deuteronomy 7:1 ) ,

so Israel possessed all the land of the Amorites, the inhabitants of
that country;
by means of the above victory they came into the lawful and rightful possession of all the land that belonged to the Amorites, who were at that time, and none else, the inhabitants of it; and therefore the Ammonites could have no claim to it, nor was any made till now.

Judges 11:21 In-Context

19 And so Israel sent messengers to Sihon, king of Amorites, that dwelled in Heshbon; and they said to him, Suffer thou, that I pass through thy land unto the river. (And so Israel sent messengers to Sihon, the king of the Amorites, who lived in Heshbon; and they said to him, Allow us to pass through thy land to the river.)

20 And he despised the words of Israel, and suffered not him (to) pass by his terms, but with a multitude without number gathered together, Sihon went out against Israel (at Jahaz), and against-stood him strongly. (But he scorned Israel's request, and would not allow them to pass through his land; and with a multitude without number gathered together, Sihon went out against the people of Israel at Jahaz, and strongly stood against them.)

21 And the Lord betook Sihon with all his host into the hands of Israel; and Israel smote him, and had in possession all the land of Amorites, the dweller(s) of that country, (And the Lord delivered Sihon with all his army into the hands of Israel; and Israel struck them down, and had in possession all the land of the Amorites, the inhabitants of that country,)

22 and all the coasts thereof, from (the) Arnon unto (the) Jabbok, and from the wilderness unto (the) Jordan.

23 Therefore the Lord God of Israel destroyed Amorites, fighting against him for his people Israel. And wilt thou now have in possession his land? (And so the Lord God of Israel destroyed the Amorites, fighting against them for his people Israel. And now wilt thou take possession of their land?)