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There appear to be at least two three distinct groups in the Calcutta Volunteer Battery, one group which served in Africa and , one, or possibly two groups, which served in Mesopotamia, and one which served in Egypt and Palestine.

There is also one death listed on the Basra Memorial where the regiment is listed as Indian Defence Force Artillery, 1st (Calcutta Port Defence) Group Garrison Artillery. Another death is listed at the Baghdad (North Gate) War Cemetery, which appears to indicate that at least some . These men fought in Mesopotamiaas part of the [[Volunteer Artillery Battery]] who fought at Kut<ref>charlie962 [https://www.greatwarforum.org/topic/225519-online-1916-article-re-calcutta-volunteer-battery-artillery-east-afr/?do=findComment&comment=2507107 Online 1916 article re Calcutta Volunteer Battery] ''Great War Forum'' 22 March 2017. Retrieved 17 October 2019.</ref> and became Prisoners of War - see [[Prisoners of the Turks (First World War)]].

There is a War Diary for service in Palestine, April 1917 to December 1918. In July 1917, when stationed at El Arish (Arish), Egypt, (this part of) the Calcutta Volunteer Battery was renamed 204th "Calcutta" Battery RGA <ref>Porter, David [httphttps://1914-1918www.invisionzonegreatwarforum.comorg/topic/forums225519-online-1916-article-re-calcutta-volunteer-battery-artillery-east-afr/index.php?showtopicdo=225519findComment&pcomment=2237636 Online 1916 article re Calcutta Volunteer Battery] ''Great War Forum'' 11 12 March 2015. Retrieved 15 March 201517 October 2019.</ref> '''Note''': For some Army record purposes, it seems this Battery had no formal existence, and the men are regarded as part of their original Volunteer Regiments.

*National Archives catalogue reference [http://discovery.nationalarchives.gov.uk/details/r/C7247323 WO 329/2939 Calcutta Volunteer Battery, East Africa miscellaneous: medal rolls. 1914-15 Star]. This database is on Ancestry.*Ancestry database for the British War Medal and Victory Medal roll, Indian Army/ The Cal.Port Def. Garr.Arty. AF page 494 (of 618) contains a list of names for Mesopotamia and East Africa, and pages 431 and 432 are stated to have more Calcutta Artillery Volunteers for Africa.<ref>charlie962 [https://www.greatwarforum.org/topic/225519-online-1916-article-re-calcutta-volunteer-battery-artillery-east-afr/?do=findComment&comment=2507288 Online 1916 article re Calcutta Volunteer Battery [Artillery<nowiki>]</nowiki>-East Afr] ''Great War Forum'' 24 March 2017. Retrieved 17 October 2019.</ref> This appears to be TNA catalogue reference WO 329/2384.

*[https://web.archive.org/web/20170302195115/http://www.westernfrontassociation.com/the-great-war/great-war-on-land/other-war-theatres/1072-indian-volunteers-in-the-great-war-east-african-campaign.html Indian Volunteers in the Great War East African Campaign] - by Harry Fecitt, now an archived webpage. Western Front Association. *1916 Photograph: Calcutta Volunteer Battery with a 12 pounder gun, Bura Camp, Kenya, East Africa, during WW1. Select image 33 from the [http://www.maryevans.com//lb.php?ref=36057 On Call in Africa Collection] Mary Evans Picture Library.

*CWGC record: [http://www.cwgc.org/find-war-dead/casualty/1660103/THOMAS,%20C%20H Thomas, C H] Indian Defence Force Artillery 1st (Calcutta Port Defence) Group Garrison Artillery Basra Memorial Date of Death: 06/06/1916. He was buried in the Mosul Prisoners of War Cemetery, and had been taken prisoner at the fall of Kut. See [[Prisoners of the Turks (First World War)]].*CWGC record: [http://www.cwgc.org/find-war-dead/casualty/634326/ McGrogan, John Strain] Died 07/01/1917. Royal Field Artillery Calcutta Volunteer Artillery Bty. Baghdad (North Gate) War Cemetery. The documents attached to the record show McGrogan died at Angora (Ankara) [Turkey], He was a Prisoner of War, captured in Mesopotamia, at the fall of Kut. See [[Prisoners of the Turks (First World War)]].