He seems to have led the forces of Elam, Marhashi, Kupin, Zahara, and Meluhha into a coalition against the Akkadian Empire, invading Khuzestan, which had been occupied by Sargon of Akkad.

[6] This led to a direct conflict with Rimush, Sargon's son and successor, who in turn invaded Elam, and victoriously confronted their armies somewhere between Awan and Susa.

And Zahara[8] and Elam and Gupin and Meluḫḫa within Paraḫšum assembled for battle, but he (Rimush) was victorious and struck down 16,212 men and took 4,216 captives.

Furthermore, the foundations of Paraḫšum from the country of Elam he tore out, and so Rimuš, king of the world, rules Elam, (as) the god Enlil had shown..."The campaign resulted in 16,212 killed on the side of the enemies, and 4,216 prisoners.

[12][6] These events apparently put an end to the influence of Marhashi in Elam.