 The 1860 Commission report recommended that Grain Tower should be turned into a fully casemated fort, which would be built around the existing structure.However, the cost of doing this was seen as excessive and the proposal was dropped as part of a cost-cutting exercise to reduce the overall cost of the fort-building programme.Instead, a
new land fort was built at Grain, while the existing battery at Garrison Point on the Isle of Sheppey was upgraded and fortified to create Garrison Point Fort.