Патч Civilization IV: Beyond the Sword v3.17

Cavalry and Cuirassiers can Flank attack Cannons and all earlier siege weapons
Gunships can Flank Attack Cannons, Artillery, Mobile Artillery
Flanking damage now depends on strength of defending unit, not on strength of siege weapon
Flank attack now has a maximum number of siege units it can affect
Horse archers no longer receive attack bonus against Trebuchets
Destroyer: no longer upgrades to anything
Stealth Destroyer: lower cost, 2 first strikes, no bombard, no interception
Attack Submarine: Increased cost
Airship no longer gets bonus attacking ships
Airship does 20% maximum air strike damage
Machine Gun and Anti-Tank get 20% air interception chance
No withdrawal when attacking amphibiously
Siege weapons cannot attack amphibiously