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Charles Nida, in his autobiography ''Chota Sahib... You've Had a Busy Day'' provides an account of the establishment and training the Battery received, but no details of its subsequent deployments.<ref> [http://books.google.com.au/books?id=3MefAgAAQBAJ&lpg=PP1&pg=PA156 ''Chota Sahib... You've Had a Busy Day''], pages 156 onwards. Google Books. Also available at the British Library UIN: BLL01014676175. There is an implication that the author may subsequently have become involved with aircraft, and it appears he became an officer in the RAF, National Archives catalogue reference [http://discovery.nationalarchives.gov.uk/details/r/D8210833 AIR 76 - Air Ministry: Department of the Master-General of Personnel: Officers' Service Records AIR 76/374/21 - Name Nida, Charles Henry George] 1918-1919</ref>

25 Battery, Machine Gun Corps (Motors), was established in India, in May 1917. Moved to Egypt July 1917. Disbanded January 1918.<ref>[http://www.1914longlongtrail.co.uk/army/regiments-1918.netand-corps/machine-gun-corps-in-the-first-world-war/motor-machine-guns-of-the-first-world-war/mmg.htm The MGC Motor Machine Gun units Guns of 1914-1918the First World War] "The Long, Long Trail"</ref> Note , this was a British Army regiment.

A booklet by Major F W Heilgers, the CO, was published in 1919, giving details of its service and giving a list of personnel (with addresses but no army numbers). The battery was formed in October 1916 from personnel of the [[Calcutta and Presidency Battalion|Calcutta Presidency Battalion]] and other Indian volunteer units and was mobilized on 1 May 1917 and sent to Egypt on 13 June 1917. It was issued with 18 sidecar outfits (presumably Clynos) and 10 solo machines in August 1917. The Clynos proved unsuitable for desert work and the battery was disbanded in December 1917. Some of the personnel were posted to other MGC units, others were sent back to India and a few were commissioned (including quite a few into the RFC/RAF). It appears the personnel were issued with numbers in the 96300 to 96380 range.<ref>gunner parr mcassell. [httphttps://1914-1918www.invisionzonegreatwarforum.comorg/forumstopic/221584-volunteer-motorcycle-machine-gun-battery-from-calcutta-india/index.php?showtopicdo=221584findComment&pcomment=2239601 Volunteer Motorcycle Machine Gun Battery (from Calcutta, India)] ''Great War Forum'' 16 March 2015. Retrieved 17 March 201521 September 2018.</ref>

There is one Medal Index Card reference where the regiment is "25th Calcutta Motor Machine Gun Battery" .<ref>[http://discovery.nationalarchives.gov.uk/details/r/D1648470 Medal card of Ainslie, C A Corps: 25th Calcutta Motor Machine Gun Battery]. The correct name is Claude John Ainslie. </ref> and five seen where the regiment is "Volunteer Machine Gun Corps", including that of Charles Nida, some of which indicate Indian Army.<ref>[http://discovery.nationalarchives.gov.uk/details/r/D4261762 WO 372/14/227845 Medal card of Nida, Charles H G Corps: Bombay Volunteer Rifles 8153, Volunteer Machine Gun Corps 96334 Gunner] , also [http://discovery.nationalarchives.gov.uk/details/r/D1386392 WO 372/2/200259 Medal card of Bolst, Bertram Sydney], [http://discovery.nationalarchives.gov.uk/details/r/D2053567 WO 372/5/136998 Medal card: Indian Army: Curtis, P H], [http://discovery.nationalarchives.gov.uk/details/r/D7564237 WO 372/28/1399 Medal card of Rann, P H], [http://discovery.nationalarchives.gov.uk/details/r/D4917265 WO 372/17/58151 Medal card of Roblin, M L]</ref>The available information is therefore sometimes indicating British Army, and sometimes Indian Army.

Virtually all the members of 25 (Calcutta) MMG Battery have surviving service records. 80 names have been found, with the first (96301 Gunner A. St C. O'Leary) enlisting on 22 August 1916 and the last (96383 Gunner A.E. O'Shea) enlisting on 12 November 1917 - a few weeks before the unit was disbanded. 12 men were from Calcutta volunteer units. Quite a few came from the East India Railway Volunteer Rifles and the Northern Bengal Mounted Rifles, those from the latter being tea planters.<ref>gunner parrmcassell. [httphttps://1914-1918www.invisionzonegreatwarforum.comorg/topic/forums221584-volunteer-motorcycle-machine-gun-battery-from-calcutta-india/index.php?showtopicdo=221584findComment&pcomment=2280549 Volunteer Motorcycle Machine Gun Battery (from Calcutta, India)] ''Great War Forum'' 04 July 2015. Retrieved 28 May 201621 September 2018.</ref>