A stone memorial tablet is located on the grounds of the Mangrove Mountain Union Church. It is dedicated to two men from the district who died while serving in the First World War. Private Richard Hubert Le Gray died of disease in South Africa in 1916 and Bombadier William Jamieson died of wounds in France in 1918. The tablet was originally attached to the exterior of the church and was unveiled on 17 October 1920. The service was well-attended by residents of the district and returned soldiers. The unveiling and dedication were performed by Presbyterian Church representative John M. McDonald (The Gosford Times and Wyong District Advocate, 21 October 1920). The church was built in 1911 and opened in 1912. It was used as a site for farewell functions for soldiers, Empire Day parades, a peace celebration in July 1919, and Anzac Day services in the years following the war (The Gosford Times and Wyong District Advocate, 28 May 1915; 18 January 1917; 24 July 1919; 1 May 1924). Two honour rolls for the war are also located inside. Access to view the tablet is restricted/timed. Commemorative services now take place at the Mangrove Mountain RSL sub-Branch, located at Mangrove Mountain Golf Club. Read more about Private Richard Hubert Le Gray and Bombadier William Jamieson on the NSW War Memorials Register.