Cannons at Kingshead?

[mm1984]

I think I read something on a thread in one of the forums here about destroying cannons at Kingshead for gold and rep. Was I just seeing things, or are there really cannons that I can bomb for gold?
I'm level 20, soon to be 21 for notoriety, and my grenades are only at lvl 4 but I have been able to level them to that point quickly on fly traps in Cuba. I was just looking for another stationary target that would give gold and/or rep points. Thanks in advance and I apologize if this is a duplicate post. I searched again but I couldn't find anything about the cannons at Kingshead.