Albert Barnes Commentary Judges 20:33

"And all the men of Israel rose up out of their place, and set themselves in array at Baal-tamar: and the liers-in-wait of Israel brake forth out of their place, even out of Maareh-geba." — Judges 20:33 (ASV)

Baal-tamar is only mentioned here. It took its name from some palm-tree that grew there; perhaps the same as the palm-tree of Deborah, between Ramah and Bethel (Judges 4:5), the exact locality here indicated, since the highway (Judges 20:31) along which the Israelites enticed the Benjamites to pursue them, leads straight to Ramah, which lay only a mile beyond the point where the two ways branch off.

The meadows of Gibeah - The word rendered “meadow” is only found here. According to its etymology, it ought to mean a “bare open place”, which is particularly unsuitable for an ambush. However, by a change in the vowel-points, without any alteration in the letters, it becomes the common word for “a cavern”.