Facing Saladin when he is at full strength is something you wouldnt want to do. So you should do this: Build a merc post, and a market. Sell all your goods, and buy about 15-20 horse archers. Make them circle Saladin's caslte, and kill all the archers. Then use your starting spearmen/ slaves and destroy saladin's mercernary post. Put a unit on the place where it once stood, so saladin can't make it again. Then wait until all the swordsmen protecting saladin is destroyed, and buy like as many assassins as you can and kill saladin.