What does Joshua 13:24 mean?

all the cities of the plain, and all the kingdom of Sihon king of the Amorites, who reigned in Heshbon, whom Moses struck with the chiefs of Midian, Evi, Rekem, Zur, Hur, and Reba, the princes of Sihon, who lived in the land.

The children of Israel also killed Balaam the son of Beor, the soothsayer, with the sword, among the rest of their slain.

The border of the children of Reuben was the bank of the Jordan. This was the inheritance of the children of Reuben according to their families, the cities and its villages.

Their border was Jazer, and all the cities of Gilead, and half the land of the children of Ammon, to Aroer that is near Rabbah;

and from Heshbon to Ramath Mizpeh, and Betonim; and from Mahanaim to the border of Debir;

and in the valley, Beth Haram, Beth Nimrah, Succoth, and Zaphon, the rest of the kingdom of Sihon king of Heshbon, the Jordan’s bank, to the uttermost part of the sea of Chinnereth beyond the Jordan eastward.