Kettle was killed in action with 'B' Company of the 9th Battalion of the Royal Dublin Fusiliers in an attack on German lines on 9 September 1916, near the village of Ginchy during the Somme Offensive in France. During the advance Kettle was felled when the Dublin Fusiliers were 'struck with a tempest of fire', and having risen from the initial blow, he was struck again and killed outright. His body was buried in a battlefield grave by the Welsh Guards, but the grave was subsequently lost trace of. His name is etched on the monumental arched gateway for the missing of the Somme at Thiepval. He was 36-years old.