Hopkinson’s service during the First World War is captured in two folders of letters he wrote to his parents in England between 1914 and 1918. Hopkinson joined the 4th Durham Light Infantry and was sent to France where he was attached to the 2nd Battalion Northumberland Fusiliers. The letters describe his life on the Western Front. He was seriously injured twice during the conflict, first on the 1st October 1915 at "Big Willie" trench in Hohenzollern Redoubt, and again in February 1917. On regaining his health in 1917, he was sent back to France and attached to the Intelligence Department, 4th Army, British Expeditionary Force, as an intelligence officer. In July 1918, he was captured while interviewing prisoners in the area southwest of Rheims. The last of his letters from this period is from the prisoner of war camp at Ingolstadt. The collection also includes a folder of letters of his brother Frank, who also fought on the Western Front as a Transport officer with the 11th Battalion, Durham Light Infantry. On 2nd August 1917, he was seriously wounded, and the collection includes a fascinating letter from his mother, dated 7th September 1917, to his father giving a report on his recovery in which she talks of the nurses and other patients she had met in the hospital in France.
The collection includes letters relating to Hopkinson’s career in India, including notes on a tour through Waziristan in 1934, and an account of the return voyage from England to India taken by Hopkinson and his family in 1938 prompted by the fear of war in Europe. There is also journal letters sent to his parents in England, including from Tibet when he was Political Officer for Sikkim, Bhutan and Tibet in 1945. In them he wrote about an official visit to the Dalai Lama, an account of Palden Lhamu procession, a visit to Drepung Monastery, and a description of a visit to Sera monastery and a young Incarnation, and the Feast of Tsongapa.