There are two “hard” raid bugs:
- pretty self-explanatory: the battering rams should not attack unless the prompt is denied. Otherwise, you can lure the battering rams to your city, kill them, then accept prompt, resulting in an easier raid.
- The raider spawn location changes after you save the game, close the game, then reload the save. This allows you to “save scum” the raider’s location, for possibly a more favorable location (for you, such as higher defenses) in your city to attack.