When i was playing in Iberia as the Berbers and the Sarmatians were laying siege to Corduba the only thing troubling me was the possibility that the Sarmatian faction leader, Boz, had recruited some graal knights (what are british graal knights doing in the Iberian Peninsular??). In the battle i lured the graal knights with some horse archers and the graal knights blindly followed dangerously close to my walls. They stupidly got so close that they got bombarded with javlins and stones from my missile troops. I have tried this tactic before but with mixed success but i see it as sheer stupidity on behalf of the AI.