I haven't played the Casse in a recent version of EB, but I understand that the Caledonians attack when you finish the road. Placing a couple of units on the way dissuaded them from attacking in my campaigns. Alternatively, you could simply not build roads and they will never attack. This will allow a longer peace and gives you more trading income. Also, I found it helpful to build a teaching grove, to keep my family members occupied while saved for and then recruited an army.
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