Source: Michael Doyle Their Name Liveth For Evermore: The Great War Roll of Honour for Leicestershire and Rutland.
He was the son of Richard Manton. The War Diary for today records. TRENCHES. Night and morning quiet. At 2.15pm enemy used trench mortar against our front line trench as yesterday. All men were cleared from action of trench bombarded. About 40 rifle grenades were fired by enemy and fell between our front and support lines. We attempted to retaliate with a trench mortar but fire was ineffectual. Considerable damage was done to our front line trench which was repaired during the night by a fatigue party from B Coy.

Source: Leicestershire War Memorials Project.
Coalville Times article - Friday April 7th, 1916

LEICESTER CONSTABLE KILLED IN ACTION

An intimation has been received by the friends of P.C. Manton, of the Leicester Police Force, that he was killed in action on March 25th. Manton was a reservist and had been on active service since August, 1914. He was 28 years of age. This is the first death among about 100 men of the borough force who have been serving with the colours.

Research undertaken and submitted by Andy Murby 13/10/2017