A feud is a dispute, a war between two clans.
You will always start the game with a feud or two.
Clans you are feuding with will be much more likely to raid you during fire season.
To end a feud, you can:
- Send an emissary, asking for peace (this is usually expensive, it will cost you about 100 cows)
- Wait for an opportunity to make peace (certain events will earn you the respect of the enemy clan, especially if you are very generous)