finally, finally, i had a pleasant experience with AI reinforcements... scipii were beseiging mesina (my city for a while now) in sicily. i had 5 militia units in the city and a no-star but high acumen governor in it. my high command star general was at the other end of the island with a small army (which included the elephant unit though). i looked at the parchment of the governor and decided i could sacrifice him if he chose to do the suicide run. so i marched my small army right to the city walls and attacked scipii. to my amazement, the reinforecements did not rush to the enenemy. they came in flanking scipii and distracted them so i could do my elephant charge followed by the 3 gold expererience general wiping the floor with them, while the other two cavalry units i had were mopping up... but my amazement was the AI general: he did not charge on his own: he basically chose the same targets my general had and reinforced the charge, consistently through the attack :) and... he did not died :)