Douglas was the third child and eldest son of John and Mary of "Heather Dene", Beech Road, Cale Green. He was educated at St Thomas' Day School and Stockport Technical School. After leaving school, he went to work for the Lancashire & Yorkshire bank at its branch on Portland Street, Manchester (and is commemorated on the company's entry in the Manchester City Battalions Book of Honour).
He was a playing member of Stockport Lacrosse Club and a member of the Cricket Club. Just after War was declared in August 1914 a number of young men started to drill at the Cricket Club prior to officially joining the army. Douglas was one and the Club's War Memorial, which includes his name, overlooks the ground where he trained. By the middle of September, he was aboard a ship bound for Egypt and the Sudan where he spent the next seven months undergoing his army training. Some details of this time are here.
On 3 May 1915, Douglas and his mates embarked to go into action at Gallipoli, arriving on the 7th. On 4 June, he took part in the attack described here. The Commonwealth War Graves Commission records that he died on this day, but there is strong evidence to think that it was not until the 8th that he was killed. One of his friends was Jack Morten, by then a recently commissioned 2nd Lieutenant. Jack's letters home have been published in a volume "I remain, your son Jack" and he mentions Douglas a couple of times.
On 7 June, after the men had been relived from the front line, he wrote "You will understand how lucky I am when I tell you there are only four of us Stockport lads who are not wounded, namely Denby, Green, Sykes and myself...". A few days later, on the 16th, Morten wrote "In one of my previous letters, I mentioned Douglas Green was all right. Well, I'm sorry to say that the day after I wrote, he went out on an errand with another fellow and never returned, but I believe his body was found in a gulley."
Douglas had been sent back with a message to Battalion Headquarters and had probably been killed by shellfire. It is understood that he was buried in what is now Redoubt Cemetery but, in the years following the evacuation from the failed campaign, the actual location of many graves was lost and Douglas is now commemorated on a special memorial within the Cemetery.