Chronica Majora by Matthew Paris
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Source: p.183, God's Warriors, Knights Templar, Saracens and the Battle for Jerusalem by Helen Nicholson & David Nicolle:
A depiction of a battle at Damietta during the Fifth Crusade, from Matthew Paris’ Chronica Majora. The Templars played an important role in the crusade. In battle they were first on to the field and last to retreat, and defended the rest of the crusader army if it was routed by the enemy.