What does Judges 11:19 mean?

but when they came up from Egypt, and Israel went through the wilderness to the Red Sea, and came to Kadesh;

then Israel sent messengers to the king of Edom, saying, ‘Please let me pass through your land;’ but the king of Edom didn’t listen. In the same way, he sent to the king of Moab; but he would not: and Israel stayed in Kadesh.

Then they went through the wilderness, and went around the land of Edom, and the land of Moab, and came by the east side of the land of Moab, and they encamped on the other side of the Arnon; but they didn’t come within the border of Moab, for the Arnon was the border of Moab.

But Sihon didn’t trust Israel to pass through his border; but Sihon gathered all his people together, and encamped in Jahaz, and fought against Israel.

Yahweh, the God of Israel, delivered Sihon and all his people into the hand of Israel, and they struck them. So Israel possessed all the land of the Amorites, the inhabitants of that country.

They possessed all the border of the Amorites, from the Arnon even to the Jabbok, and from the wilderness even to the Jordan.