Suppiluliuma then recounts how the land of Isuwa on the upper Euphrates had seceded in the time of his grandfather. Attempts to conquer it failed. In the time of his father, other cities rebelled. Suppiluliuma claims to have defeated them, but the survivors fled to the territory of Isuwa that must have been part of Tushratta's realm. A clause to return fugitives was part of many treaties made at the time, so possibly the harbouring of fugitives by Isuwa formed the pretext for the Hittite invasion.