Hmm, tricky! My grandfather and his brothers fought in Salonika too (on the non-Indian side of the family). You might be able to narrow down what regiment he was with by checking this site, which lists the regiments who were there - http://www.salonikacampaignsociety.org.uk/ It's still a lot, but a lot less than the ones who stayed in France! Then maybe check out which regiments were in India for the appropriate time scale - surely there weren't that many who were in both places? Joss Mel wrote - William Henry Button (b 1883, Nottingham) initially joined the army to fight in the Boer War but was bought out by his parents. He later joined the army (maybe at outbreak of WW1 as he was still at the family household in 1911 census) and during WW1 he served with the forces in France, Salonica and the Dardenelles. He also served in India for seven years as Quartermaster Sargeant. And while in India he was flyweight boxing champion three years running.