Changes

Regimental History: ''The Royal Deccan Horse In The Great War'' by Lieutenant-Colonel E. Tennant 1939. Available at the [[British Library]], and in a reprint<ref>[https://www.naval-military-press.com/product/royal-deccan-horse-in-the-great-war/ ''The Royal Deccan Horse In The Great War''] Naval & Military Press</ref> edition, which in turn is available as an online book on the Ancestry owned pay website fold3, see below.

The regiment served on the [[Western Front]], including a taking part in a futile counter attack at Festubert.in December 1914<ref>Broomfield, Steven. [httphttps://1914-1918www.invisionzonegreatwarforum.comorg/forumstopic/236733-captain-charles-alexander-chandos-mackenzie-20th-deccan-horse-kia/index.php?showtopicdo=236733findComment&pcomment=2369529 Captain Charles Alexander Chandos Mackenzie - 20th Deccan Horse- kia] ''Great War Forum'' 26 February 2016. Retrieved 26 February 201627 September 2018.</ref>, and taking part in the Battle of Bazentin Ridge, part of the attack on High Wood in July 1916.

*''History of the Thirtieth Lancers Gordons Horse'' by Major E A W Stotherd 1911 is available to read online on the [[Online books#Digital Library of India| Digital Library of India]] website, in TIFF format, and as a mirror edition on [httphttps://dliarchive.sercorg/details/in.iiscernet.ernetdli.in/handle/2015/.278870 pdf to downloadArchive.org], originally from Digital Library of India. This regiment was previously called the [[4th Lancers, Hyderabad Contingent]]. The preface states that a great deal of information will be found about the other three regiments of the Hyderabad Contingent Cavalry, as in many despatches they seem to have been regarded as one large corps.*[https://archive.org/stream/southernindia00pennuoft#page/n21/mode/2up Illustration: "A Jemadar of the 20th Deccan Horse"], near the front of the book ''Southern India'' Painted by Lady Lawler, Described by F E Penny 1914 Archive.org*''The Royal Deccan Horse In The Great War'' is available in a reprint edition, which in turn is available as an [https://www.fold3.com/browse/251/hTGb85NZ8wIfXXI19CjO4DISA online book on the Ancestry owned pay website fold3] (located in World War II/Military Books/Britain, under letter T).