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I might have missed it in the manual but sometimes I find that when I go raiding during fire and storm season, the only clans available for raiding are my closest neighbours. As in I can't choose clans that aren't my neighbouring clans (or clans that I'm not feuding with) to raid.

I wonder if anyone else has come across this difficulty? Does it have to do with stage of the game? (clan vs tribal?)

I think this is in the manual.

Without a lot of coordination (like a tribe), your warriors can’t make long journeys to go raiding. It’s not like you’re a Roman army with a baggage train.

Feuds burn hot enough that exceptions can be made.