Braziers on Pclaim and Town Claim

I have a question about Braziers, in anticipation of placing a town claim over my area. If I have a town claim and 2 pclaims within the town, and I have braziers within the pclaims, do they only fight intruders in the pclaim or do they defend my town claim as well? If so, will they also protect the other pclaim if it is in close proximity? I know pclaims override a lot of the town settings, but how do braziers interact?