A military narrative recounting major campaigns and battles across the war’s principal theaters: trench warfare and assaults such as Neuve Chapelle and Verdun; the Italian front with Isonzo and Tyrolean operations; the Gallipoli campaign and ANZAC amphibious assaults; the fleet action at Jutland; Russian operations including sieges and retreats; Balkan political and military shifts involving Bulgaria, Greece, and Salonika; and Mesopotamian sieges and the capture of Baghdad. Chapters combine tactical description, operational context, casualty-heavy accounts, and illustrations of logistical, naval, and diplomatic factors that shaped each theater.