OK, well I knew I didn't remember the factoid in all its detail, so I guess there's a qualifier I forgot: "directly attacked by the Germans". Most of the other things you guys cited were Japanese attacks, or offshore somewhere.

This page shows the memorial which gives the details: Lance Cove, on Bell Island, was the only community to have taken a direct attack from a torpedo fired by a Nazi U-boat. http://ngb.chebucto.org/Dist_Photo/hm-bell-island.html