Haulbowline, Cork was designated as a Class B Naval Dockyard by the Home Ports Defence Committee, later the Home Defence Committee. The defences around Cork Harbour were intended to deal with armoured cruisers.
The primary fortifications protecting Cork Harbour:
- Fort Westmorland
- No.3 Bastion, which had RML guns that were replaced with two 6-inch Mark VII guns mounted between 1902 and 1905 .
- Fort Carlisle
- North Battery built inside the Fort between 1899 and 1900 to mount two 6-inch Mark VII guns.
- Rupert’s Tower Battery built between 1899 and 1901 on an old RML battery to mount two 6-inch Mark VII guns.
- Number 1 Battery built between 1899 and 1904 to mount three 12-pdr Q.F. guns.
- Fort Camden
- Left Lower Battery built between 1899 and 1901 to mount two 12-pdr Q.F. guns.
- Right Upper Battery built between 1901 and 1905 to mount three 12-pdr Q.F. guns.