Yarmouth Castle continued to be used, and records from 1718 and 1760 show it was equipped with eight 6-pound (2.7 kg) and five 9-pound (4.1 kg) guns along the castle and the quay platforms, respectively.
Throughout this period it was probably staffed by a captain and six gunners, supported by the local militia.
In the early 18th century, Holmes' mansion was rebuilt, forming its current appearance.
By the 18th century, however, Yarmouth Harbour had gradually silted up and been destroyed by industrial developments, reducing the value of the anchorage, and the design of the castle had become outdated.

In 1813, during the Napoleonic Wars, work was carried out to alter the design of the parapet.
The Crimean War sparked a fresh invasion scare and in 1855 the south coast of England was refortified.
Yarmouth Castle underwent considerable repairs that year; four naval guns and traversing rails were installed on the castle platform, and a regular county army unit was put in place to garrison the fort.
In 1881 a proposal was put forward to modernise the entire fortification, but this was rejected and in 1885 the garrison and the guns were withdrawn.

The coastguard began using the castle as a signalling station in 1898.
In 1901, the War Department passed the castle to the Commissioners of Woods and Forests and in 1912 parts of the castle were leased to the Pier Hotel, which incorporated Robert Holmes's former mansion; the Pier Hotel eventually became the George Hotel and still occupies part of the old castle moat.
The Office of Works took control of the castle in 1913, carrying out a programme of repairs, and it was used by the military in both the First and Second World Wars.
It was finally retired from military use in the 1950s.

In the 21st century, Yarmouth Castle is run by the heritage organisation English Heritage as a tourist attraction, receiving 9,007 visitors in 2010.
It is protected under UK law as a Grade I listed building and as a scheduled monument.
Yarmouth Castle continued to be used, and records from 1718 and 1760 show it was equipped with eight 6-pound (2.7 kg) and five 9-pound (4.1 kg) guns along the castle and the quay platforms, respectively. Throughout this period it was probably staffed by a captain and six gunners, supported by the local militia. In the early 18th century, Holmes' mansion was rebuilt, forming its current appearance. By the 18th century, however, Yarmouth Harbour had gradually silted up and been destroyed by industrial developments, reducing the value of the anchorage, and the design of the castle had become outdated.
In 1813, during the Napoleonic Wars, work was carried out to alter the design of the parapet. The Crimean War sparked a fresh invasion scare and in 1855 the south coast of England was refortified. Yarmouth Castle underwent considerable repairs that year; four naval guns and traversing rails were installed on the castle platform, and a regular county army unit was put in place to garrison the fort. In 1881 a proposal was put forward to modernise the entire fortification, but this was rejected and in 1885 the garrison and the guns were withdrawn.
The coastguard began using the castle as a signalling station in 1898. In 1901, the War Department passed the castle to the Commissioners of Woods and Forests and in 1912 parts of the castle were leased to the Pier Hotel, which incorporated Robert Holmes's former mansion; the Pier Hotel eventually became the George Hotel and still occupies part of the old castle moat. The Office of Works took control of the castle in 1913, carrying out a programme of repairs, and it was used by the military in both the First and Second World Wars. It was finally retired from military use in the 1950s.
In the 21st century, Yarmouth Castle is run by the heritage organisation English Heritage as a tourist attraction, receiving 9,007 visitors in 2010. It is protected under UK law as a Grade I listed building and as a scheduled monument.
Yarmouth Castle