during WWI as a Lieutenant, 3rd Bn, Royal Berkshire Regiment 
In the TNA Medals Archive ref WO/372/20, image ref 13666, he started as a 2/Lt with the 3rd berks regt and then became Lt with the 2nd berks regt. he received the 1914-15 star and fought in France. The record does not mention that he was killed in action.
On the memorial of those with no known grave at the PLOEGSTEERT MEMORIAL, Comines-Warnerton, Hainault, Belgium.
[S189] Powys-Lybbe, Antony & Timothy Francis Powys-Lybbe, (Winkfield, United Kingdom: www.powys.org, from 13 Jan 2007), Powys-Lybbe forbears (Reliability: 4).
~ England BMD Index, Dec 1885 births and 1914-1921 Officer deaths overseas. ~ UK Census, 1901 PRO ref RG 13/1143 for The Rectory, Whitchurch Oxon.