from Mount Halak, which rises toward Seir, as far as Baal-gad in the Valley of Lebanon below Mount Hermon. And he captured all their kings and struck them and put them to death.
The Canaanites' refusal to seek peace was their fatal blindness. God hardened hearts already bent on war; they chose enmity with Israel when they might have made terms, as Gibeon did. Hardness of heart is the sinner's ruin, and those left to their own stubborn pride are already marked for destruction.
AI summary
Commenting on Joshua 11:15-23
Even from the mount Halak, that goeth up unto Seir,.... Or the "smooth" and "bald" mountain, which had no trees on it, as some interpret it, observed by Kimchi; it was a mount on the borders of Edom, to which the land of Canaan reached on that side: even unto Baalgad, in the valley of Lebanon, under Mount Hermon; and so describes the northern part...
from the mount Halak--Hebrew, "the smooth mountain." that goeth up to Seir--an irregular line of white naked hills, about eighty feet high, and seven or eight geographical miles in length that cross the whole Ghor, eight miles south of the Dead Sea, probably "the ascent of Akrabbim" [ROBINSON]. unto Baal-gad in the valley of Lebanon--the city or temple of the god of destiny, in Baalbec.