A feature of colonial warfare in the late 17th/early18th century is the Garrison House. Usually there would be at least one per settlement and they would offer collective protection in times of French and Indian attack. They were generally strong enough to resist attacks though those outside of the relative safety could expect little help. Garrison Houses of New England tells you how many are still standing and those open to the public.
More info here
Deerfield 1704 site - much explanatory information and images about the whole business of raids .