Another possible reason for the treaty between Aram-Damascus and Israel was the common threat of the Neo-Assyrian Empire which was attempting to expand into the Mediterranean coast. In 853 BC, King Hadadezer of Damascus led a Levantine coalition, that included forces from the northern Aram-Hamath kingdom and troops supplied by King Ahab of Israel, in the Battle of Qarqar against the Neo-Assyrian army. Aram-Damascus came out victorious, temporarily preventing the Assyrians from encroaching into Syria. However, after Hadadzezer was killed by his successor, Hazael, the Levantine alliance collapsed. Aram-Damascus attempted to invade Israel, but was interrupted by the renewed Assyrian invasion. Hazael ordered a retreat to the walled part of Damascus while the Assyrians plundered the remainder of the kingdom. Unable to enter the city, they declared their supremacy in the Hauran and Beqa'a valleys.