And the king of the children of Ammon answered unto the messengers of Jephthah, Because Israel took away my land, when they came up out of Egypt, from Arnon even unto Jabbok, and unto Jordan: now therefore restore those lands again peaceably.
The king of ... Ammon answered ... Because Israel took away my land - (see the note at Deuteronomy 2:19-37.) The subject of quarrel was a claim of right advanced by the Ammonite monarch to the lands which the Israelites were occupying.