Thomas Leah joined the Royal Artillery in 1899. During the First World War he was a Major in the Royal Field Artillery, in charge of a Battery of men who were responsible for deploying horse-drawn guns close to the front line. This collection of items was displayed at the National Assembly for Wales building in Cardiff Bay, for the Cymru'n Cofio 1914-18 / Wales Remembers 1914-18 exhibition between November 2015 and February 2016.