I have had this happen to me in several different games now where my mounted units survive an attack on a stack containing siege but no damage is done to the siege. Attached are a save and screen shot right after one of my Horse Archers attacked Hwang Kong's city with 2 Hwachas in it. Horse Archer survived and damaged the defending archer, but both Hwachas are unscathed. And its not just Hwachas that don't work. I have this happen in at least 3 other games with all different combinations. Horse Archers versus catapults, calvary against cannon, gunships versus artillery all with no flanking damage. But it isn't broken with the AI as I've had siege destroyed by AI flanking attacks. Is there a fix for this?