![Paul Reed on X: "Birth of Trench Warfare: Two British officers in an early trench system on the Aisne in September 1914. The officer on the right is a Gunner officer, most Paul Reed on X: "Birth of Trench Warfare: Two British officers in an early trench system on the Aisne in September 1914. The officer on the right is a Gunner officer, most](https://pbs.twimg.com/media/EnmICm1WEAAl-b8.jpg:large)
Paul Reed on X: "Birth of Trench Warfare: Two British officers in an early trench system on the Aisne in September 1914. The officer on the right is a Gunner officer, most
FORWARD OBSERVATION OFFICER WITH 55/53RD BATTALION, LIEUTENANT W. M. FINLEY OF NSW, CLIMBS A TREE ... | Australian War Memorial
![A British artillery officer with Armenians at a forward observation post, Baku, September 1918 | Online Collection | National Army Museum, London A British artillery officer with Armenians at a forward observation post, Baku, September 1918 | Online Collection | National Army Museum, London](https://collection.nam.ac.uk/images/960/190000-190999/190623.jpg)
A British artillery officer with Armenians at a forward observation post, Baku, September 1918 | Online Collection | National Army Museum, London
![File:Forward Observation Post of "B" Battery, 1st Field Regiment, Royal Canadian Artillery Poste d'observation avancé de la Batterie « B », 1er Régiment d'artillerie de campagne, Artillerie royale du Canada (4678561325).jpg - File:Forward Observation Post of "B" Battery, 1st Field Regiment, Royal Canadian Artillery Poste d'observation avancé de la Batterie « B », 1er Régiment d'artillerie de campagne, Artillerie royale du Canada (4678561325).jpg -](https://upload.wikimedia.org/wikipedia/commons/4/4e/Forward_Observation_Post_of_%22B%22_Battery%2C_1st_Field_Regiment%2C_Royal_Canadian_Artillery_Poste_d%27observation_avanc%C3%A9_de_la_Batterie_%C2%AB_B_%C2%BB%2C_1er_R%C3%A9giment_d%27artillerie_de_campagne%2C_Artillerie_royale_du_Canada_%284678561325%29.jpg)