Raid

A Raid is a special event that's frequency can be adjusted using Raid Frequency Settings

See Raiders for frequency details

During the Raid a large number of Raiders will be summoned. The more settlers you have, the more they will try to kill before leaving.
If you have less than 7, they will only kill 1. If you have less than 12, they will kill 2; at less than 17, they will kill 3; up to a maximum of 5 killed settlers.

Raid will continue until a message pops up that the Raiders are leaving, or until The Player has defeated all the spawned Raiders.

If a settler dies during a raid, they do not respawn, but the same type has a very high chance to arrive soon after to be recruited.