Dennis enlisted on 16th August 1915. He was 19 years and 7 months old, and a clerk by trade. He embarked at Southampton, with his unit, on 12th November 1915. Disembarking at Havre 4 days later, he entered the war in France on 16th November 1915. He was admitted onto the 33rd Casualty Clearing Station on 17th March 1916 suffering with appendicitis. He died at 7.15 a.m. in No 20 General Hospital. He was the son of Edwin Shadwich and Edith Ellen Perrett of Boldmere Road, Erdington, Birmingham.