Bell's early career was shaped by his appointment in 1914 as chaplain to Archbishop Randall Davidson, one of the key figures in twentieth century church history. Bell subsequently wrote the standard biography of Davidson. Bell received a special commission for international and inter-denominational relations. In this office he ensured in 1915 that the Lutheran Indians be allowed to continue the work of the Leipzig – and the Goßner missions in Chota Nagpur in India, after the missions' German missionaries had been interned. Until the end of the First World War, he also worked for the Order of Saint John, a supra-confessional group working to help those orphaned by the war and – together with the Swedish Lutheran archbishop Nathan Söderblom, one of his closest lifelong friends – for the exchange of prisoners of war. In this work, he came to see internal Protestant divisions as more and more insignificant.