The confrontation took place at Mari, near Darbsakon on 24 August 1266, where the heavily outnumbered Armenians were unable to resist the much larger Mamluk forces.

[2] The Armeno-Mongol son of the Constable Sempad, named Vasil Tatar, was also taken prisoner by the Mamluks and was taken into captivity with Leo, although they are reported to have been treated well.

[3] Following their victory, the Mamluks invaded Cilicia, ravaging the three great cities of the Cilician plain: Mamistra, Adana and Tarsus, as well as the harbour of Ayas.

Hetoum I had to negotiate the return of his son Leo by giving control of Armenia's border fortresses to the Mamluks.

[4] Leo was left in the awkward situation of keeping Cilicia as a subject of the Mongol Empire, while at the same time he was paying tribute to the Mamluks.