It was subsequently part of St. George's Garrison until the 1950s, with HMCS Somers Isles, a Royal Canadian Navy training base, established there during the Second World War.

Convict Bay was transferred to the Army in the 1860s (along with other Admiralty properties at the East End and in the Central parishes), and the army merged the facility with the adjacent St. George's Garrison, which overlooked it, and used the bay for various purposes (initially as a Royal Engineers yard) until the Second World War.

The military detachments housed there were withdrawn to make way for the Royal Canadian Navy's HMCS Somers Isles for the duration of the war.

It was part of the War Office and Admiralty lands slated for disposal in the 1950s.

After the departure of the military from Convict Bay and the rest of St. George's Garrison, the area is now a residential neighbourhood.