 It probably served as a pele tower as there is no evidence of a church on site.The land around the tower was purchased in 1759 by the Board of Ordnance to build an artillery battery to defend the interior of Milford Haven Waterway from attack.It was originally outside the dockyard walls when they were built in the mid-1810s, but expansion of the dockyard in 1844 brought it inside the walls.