14 april 1915
25 february 1916
4 march 1916
1 august 1916
9 november 1916
20 january 1917
28 april 1917
31 july 1917
7 november 1917
Commissioned as a Second Lieutenant in the 10th Battalion, South Staffordshire Regiment.
However he had to declined it owing to the ill-health of his parents.
Awarded a testimonial on vellum by the Royal Humane Society for having, "on 19th July last rescued two girls from 12 feet of water at Castlerock, County Derry." (Belfast News-Letter 25 September 1915)
Enlisted in the North Irish Horse at Dublin
joining the regiment at Antrim , where he was posted to H Squadron.
He applied for a commission in the artillery or infantry
He was posted as a cadet gunner to B Reserve Brigade of the Royal Horse Artillery at St John's Wood, London Commissioned as a Second Lieutenant in the Royal Garrison Artillery
Embarked for France as part of 323 Siege Battery.
Posted to the 90th Brigade, Royal Garrison Artillery (90th Heavy Artillery Group), which had arrived in France at the beginning of April and was on the Ypres front.
Killed in action at Vlamertinghe
He was mentioned in Field Marshal Haig's despatch
Linden's body was buried in the Vlamertinghe New Military Cemetery, Plot 5, Row G, No.16, and marked with a cross. After the war when the cemetery was checked for graves, there was no sign of it.
It is believed that the site had been subjected to shellfire and many graves destroyed.
In 1922, Imperial War Graves Commission considered erecting a row of special memorials for the missing graves, but it was finally decided that it would be more appropriate to add their names to a memorial to the missing as that was more applicable to the believed status of their bodies. Linden is therefore commemorated on the Ypres (Menin Gate) Memorial,
Trinity College , Dublin