This article integrates a Kurigalzu II reading of the Berlin letter (VS 24.91) with other evidence for early Middle Elamite (ME I) history. In addition to Elamite evidence, key data comes from the Babylonian Chronicle P, which deals with two wars of Kurigalzu with Elam. It is argued here that Kurigalzu I defeated Tepti-ahar (Chronicle P ii), who agreed to a settlement that recognized Kurigalzu’s superior position. This agreement served both rulers very well, allowing Tepti-ahar to continue building Haft Tappeh Level II and eventually gain a strong position vis-à-vis Kurigalzu’s weaker successor Kadašman-Enlil I (HT 38). But the subsequent alliance of Burna-Buriaš II with Aššur-uballiṭ I led to a late ME I Elamite decline, reflected by Inšušinak-šar-īli not building at Haft Tappeh and Burna-Buriaš II eventually destroying Level II. As this alliance weakened, Šalla started to rebuild Haft Tappeh (Level III) late in Burna-Buriaš’s reign or shortly after, but weakened himself by a failed attack on the pro-alliance faction in Babylonia early in the reign of Kurigalzu II (CUSAS 17.61). This allowed a Hurrian-Elamite from the north, Ḫurbatila, to obtain the throne, with Šalla becoming his vassal and ceasing work at Haft Tappeh. Ḫurbatila was eventually defeated by Kurigalzu II (Chronicle P iii 10-19), who proceeded to thoroughly conquer Elam, destroying Haft Tappeh IV and exploiting his victory to install Pahir-iššan as a junior partner allied by marriage (start of ME II).