Adam Clarke on Judges 5:17

Gilead abode beyond Jordan - That is, the Gadites, who had their lot in those parts, and could not well come to the aid of their brethren at a short summons. But the words of Deborah imply a criminal neglect on the part of the Danites; they were intent upon their traffic, and trusted in their ships. Joppa was one of their sea-ports.

Asher continued on the seashore - The lot of Asher extended along the Mediterranean Sea; and being contiguous to Zebulun and Naphtali, they might have easily succoured their brethren; but they had the pretense that their posts were unguarded, and they abode in their breaches, in order to defend them.