Topic: Bug Report: City and Path calculation

I don’t know how to describe this bug rightly, but I try. Sorry my english.

One village gives me quests about raiders, who are placed near on map, but too far by path – another side of river, about 4 or 5 days travel.
I canceled quest “Kill raiders in their camp”, and took another “Protect village against raiders”, but they didn’t come at all – I waited 2 days, but no event about “raiders come”. As I understand, they did all this path till I canceled this quest.