Papers relating to bombardment of Hartlepool by three German battle cruisers, 16 Dec 1914, dated 1914, 1920, 1922, [1930-1940], 1934, 1938, notably including Trechmann's official report to Lt Col L Robson, Officer Commanding, Durham Royal Garrison Artillery, dated 16 Dec 1914; Robson's official report to the Fortress Commander, West Hartlepool, dated 16 Dec 1914; 'The bombardment of the Hartlepools' by Capt W A Murley, an offprint from the [Royal Regiment of Artillery] journal, [1930-1940]; The Great War: I was there! part 7 (1938), including an anonymous article on 'British pluck and luck at the Hartlepools'. Typescript text on his military service, 1914-1917, notably his experiences with the Heugh Battery, Hartlepool, 1914-1915, and with 41 Siege Battery at the Battle of the Somme, 1916, and Battle of Vimy Ridge, 1917.