History borrowed again from Undergeround kent
In the early 20th century the tower was upgraded to be armed with two 4.7in BLs. In order to accommodate these guns a raised concrete and stone structure was built on the roof, which in addition to providing a platform for the guns, also provided shelter that could be used for stores and fire control. At the same time work was undertaken within the main body of the tower to make better ammunition storage to supply these new guns.
Shortly after these modifications a boom defence was constructed across the River Medway towards Sheerness. The tower became an anchor point for this boom, connecting it to Grain beach.
Further additions and modifications were made during the Second World War, in particular the large roofed emplacement that supported a twin 6pdr QF gun. Behind this was a directing tower and a light emplacement. The biggest addition at this stage was the barrack block; it was made of concrete and stands on stilts with access to and from the main tower.