Adam Clarke on Judges 16:3

Took the doors of the gate - Though Samson was a very strong man, yet we do not find that he was a giant; consequently we may conjecture that the gates of the city were not very large, as he took at once the doors, the two posts, and the bar, with him. The cities of those days would appear to disadvantage among modern villages.

A hill - before Hebron - Possibly there were two Hebrons; it could not be the city generally understood by the word Hebron, as that was about twenty miles distant from Gaza: unless we suppose that על פני חברון al peney Chebron is to be understood of the road leading to Hebron: he carried all to the top of that hill which was on the road leading to Hebron.