I used Sword & Spear (2nd Edition) rules by Mark Lewis, published by Great Escape Games.
I have used one unit is represented by 2 square bases, so 4 cavalry figs or 8 infantry figs to a unit.
The red and black dice indicate activations, The numbered discs represent hits. The yellow and blue dice (where shown) represent combat results.
Crusaders on the left. The City of Acre lies off-table behind the Crusaders.
The deployment was done using the Attack on a Prepared Position scenario but I varied the allowed Stratagems to better suit the situation.
Both sides are heavy on cavalry.
I made the assumption that the Saracens preceded their attack with harassing arrow fire and that the Crusader cavalry had already moved through the infantry to try to push away the attackers leaving the infantry as a back stop.