 This left the Hittite homelands vulnerable to attack from all directions, and Hattusa was burnt to the ground sometime around 1180 BC following a combined onslaught from new waves of invaders, the Kaskas, Phrygians and Bryges.The Hittite Kingdom thus vanished from historical records, much of the territory being seized by Assyria.Alongside with these attacks, many internal issues also led to the end of the Hittite kingdom.