Gebal, and Ammon, and Amalek; the Philistines with the inhabitants of Tyre;
Gebal, and Ammon, and Amalek. Gebal was an Idumean clan, on the right of Ammon, as Amalek was on the left of Ammon, and extended thence to the region between Idumea and Egypt. Ammon held the region between the Arnon and the Jabbok. So in Judges 3:13, Eglon, the king of Moab, had Ammon and Amalek as his allies in smiting Israel.
The Philistines with the inhabitants of Tyre. To the seven nations who constituted the main body, three more nations joined themselves-the Philistines, dwelling south and west of Canaan; Tyre, though not warlike but mercantile, always ready to embrace an opportunity of gain (Ezekiel 27:1-36; Ezekiel 28:2-24). So in Amos 1:6-10, the Philistines, the Tyrians, and Edomites appear combined against Israel. Compare Joel 3:4-6, where Tyre's greed of gain appears in her trading Jewish captives as slaves obtained from the Philistines; the acquisition of Jewish slaves would be one of her objects in joining the invasion.