Did Templar knights ever fight alongside Mongols forces?

Yes, the Knights Templar did engage in cooperation with Mongol forces during the 13th century. In particular, there were instances in which the Templars allied with the Mongol Empire against their common adversary, the Muslim states in the Levant. This collaboration was part of broader efforts by the Crusader states to seek military support from the Mongols to counteract Muslim power in the region. However, these alliances were often complicated and did not lead to sustained cooperation.