(The "Apology of Hattushil" presents this era's history from a Hittite perspective)
When Murshil II passed, his eldest son, Mutallu (1329-1290), was crowned child-king of the Hittites. Yet, his inheritance did not solely include his father's throne but also the intense border-situation with Assyria on the Euphrates boundary. Much like the earlier days of centuries long past, when the Egyptians would skirmish with the Hittites throughout Syria, new skirmishes were becoming increasingly common between the Hittites and Assyrians in the lands of the Mitanni.
Both nations exuded confidence at the other side, but it all resulted in no more than a rattling of swords for the time being. If one positive can be drawn from the rulership of Mutallu it was that open war with the Assyrians continued to be held at bay.
Next, it was Hattushil (1289-1256) who assumed the Hittite kingship. Perhaps gaining the throne as a mature adult man fostered the cunning edge in what he had in store for his eastern neighbors. The new king wished to take full advantage of Assyria's geography, that while the kingdom was growing rapidly in strength and population, she was surrounded by strong rivals. King Hattushil was well aware of the Kassites' hatred toward Assyria, spurned by the embarrassment of unforgettable battlefield losses in some recent years, and he intended to put that knowledge to good use.
Hattushil's first major act was to correspond with Babylonia, the kingdom of the Kassites, and directly with their king, Kadashman-Turgu (1293-1277), and to forge a treaty of alliance. When news of this alliance spread, so too did new pressures increase tenfold upon Assyria. With Babylonia to her south, in friendship with the Hittites to the west, the Hittite king's hope was that Assyria's focus would stay on the east toward Elam as well as to her uncontested northern front. It was all a matter of positioning. A way of setting the board. To create a deterrent with one unmistakable message:
That to expand south or west would enrage not one enemy, but two.