Raids


 * When relations with a tribe are negative, there is a chance that tribe will send a raiding party to attack your group.


 * The probability of a raid occurring is dependent on how negative your relations are with a tribe.


 * The size of a raid is proportional to the size of a tribe.


 * It can be a good idea to take actions that upset a smaller tribe but impress a larger tribe in order to avoid being raided by the larger tribe.