Unto the Red sea Unto which they came three times; once, Exodus 13:18; again, a little after their passage over it; and a third time, long after, when they came to Ezion-geber, which was upon the shore of the Red sea, from whence they went to Kadesh; of this time he speaks here. In the like manner they sent to the king of Moab We do not read of such a message sent to the Moabites; but when the Israelites came from Ezion-geber into the wilderness of Moab, we find a command of God given to them not to distress the Moabites, nor contend with them in battle. This intimates there was some occasion for such a command, which was probably their refusing to grant them some common civility.
Related Commentaries of Judges 11:16
Judges 11:16-17
16 But when Israel came up from Egypt, and walked through the wilderness unto the Red sea, and came to Kadesh;
17 Then Israel sent messengers unto the king of Edom, saying, Let me, I pray thee, pass through thy land: but the king of Edom would not hearken thereto. And in like manner they sent unto the king of Moab: but he would not consent: and Israel abode in Kadesh.