Mervani State's expedition to Armenia In January 1241, al-Mansur was appointed commander-in-chief of the allied Ayyubid-Seljuk forces, and pursued any Khwarezimid army that crossed the Euphrates, pillaging several Syrian towns.
Surviving Khwarezemid soldiers fled to Harran where they gathered their families and moved south to territory controlled by the Abbasid Caliphate.
He joined forces with the Seljuk army and together they overwhelmed the fortress of Amid held by the sultan as-Salih Ayyub who attempted to hold Syria and al-Jazira for his Ayyubid Egypt.
[3] The Khwarezemids, with the aid of Jamiul of Salkhad besieged Damascus in March 1246 and were joined by as-Salih Arif Ismail who now held Baalbek.
However, al-Mansur and an-Nasir Yusuf of Aleppo made an alliance and decided to confront the Khwarwezmids, who they feared could take control of Syria should they seize Damascus.
Under al-Mansur, Homs, the smallest Ayyubid principality, wielded great influence in imperial affairs, but with his demise, it returned to its accustomed passivity.