I think the Shepherd painting of Mirbat might be (a bit) technically inaccurate.
It shows the 25 pdr gun apparently firing along the length of the fort wall and the gunpit seems to be similarly aligned. IIRC the gunpit had its back to the fort wall and although the gun can be traversed of course, the tower's not in the right place.
Somebody put me straight!
Old Duffer
PS I note that Storm Force reminds readers that Labalaba should have received a VC if there was any justice but that is probably now a lost cause. Those who matter, know what he did.