Charles Ellicott Commentary Judges 1:5

"And they found Adoni-bezek in Bezek; and they fought against him, and they smote the Canaanites and the Perizzites." — Judges 1:5 (ASV)

They found. — The expression perhaps alludes to the suddenness of their march, which enabled them to take the lord of Bezek by surprise.

Adoni-bezek. — This is not a proper name, but a title, meaning “lord of Bezek,” as Adoni-zedek, in Joshua 10:1, and perhaps Melchi-zedek, in Genesis 14:18.

They slew the Canaanites and the Perizzites. — This seems to refer to a second battle, or perhaps to the slaughter in the city after the battle described in the last verse.