[4][5] Used as a coastal artillery position until the 1940s,[4] and as a military training camp until the late 20th century, many of the structures of the 37-acre site were dismantled over time, and part of the complex used as a pitch and putt course.

[6] In 2009, Cork County Council added the site to a proposed list of protected structures[7] – though as of 2022 it remained in the ownership of the Department of Defence.

[9] By the early 20th century, a number of improvements were proposed to the harbour defences – including the installation of newer Breech-loading 9.2 Inch guns.

During the Irish War of Independence (1919–1921), Templebreedy was somewhat isolated, and ambushes by IRA Brigades were not uncommon on supplies to the fort.

[18] As of the early 21st century, though a number of buildings, concrete emplacements, underground magazine stores and other structures still stand, no guns or defensive elements remain, and the site is no longer used for military purposes.