[1] In 1910, its headquarters was moved to Galle Buck Road in Colombo Fort (which is now part of SLNS Parakrama).

These formations defended Colombo and Trincomalee during the air attacks that occurred as part of the Indian Ocean raid by the Imperial Japanese Navy.

[3][4] The CGA was also deployed overseas to support the Allied and Commonwealth forces in the Indian Ocean.

A detachment of CGA was deployed in defence of the Seychelles and the Cocos Islands manning 6 inch Coastal Guns.

Perera, ED manning the BL 6 inch coastal guns, made up of officers and men of the Ceylon Garrison Artillery.

In the same year the 3rd Field Artillery Regiment was formed equipped with ML 4.2-inch heavy mortars.

With the onset of the Sri Lankan Civil War, SLA grew in size and added British Ordnance QF 25 pounder Mark III field guns to its inventory.

24 3.7-inch AA guns were in service till the early 1990s[6] New regiments were formed with new sources of weaponry in the 1990s and 2000s from China and the Czech Republic.

During the civil war, SLA has provided fire support for almost all military operations carried out by the Sri Lanka Army.

In 2020, the SLA raised the 15th Drone Regiment for surveillance and target acquisition, deploying UAVs to monitor isolated areas during the COVID-19 pandemic.