Field Army

An Army, also known as a Field Army, is a large military unit formed of two or more Corps, which in themselves are made up of Divisions. Armies are commanded by Generals and are typically numbered to distinguish themselves from other armies in an Army Group. In English the numbering system for identifying armies uses word numbers, which start from "First" and increase sequentially, whereas Corps use Roman numerals ( I, II, III, IV, V ) and subordinate formations use ordinal numbers (1, 2, 3, 4, 5). During the First World War the British Army comprised five armies:


 * First Army – commanded by:
 * Lieutenant-General Sir Douglas Haig 1914–1915
 * General Sir Henry Rawlinson 1915–1916
 * General Sir Charles Monro 1916
 * General Sir Henry Horne 1916–1918


 * Second Army – commanded by:
 * General Sir Horace Smith-Dorrien 1914–1915
 * General Sir Herbert Plumer 1915–1917
 * General Sir Henry Rawlinson 1917–1918


 * Third Army – commanded by
 * General Sir Charles Monro 1915
 * General Edmund Allenby 1915–1917
 * General Sir Julian Byng 1917–1918


 * Fourth Army – commanded by
 * General Sir Henry Rawlinson 1916–1918


 * Fifth Army – commanded by
 * General Sir Hubert Gough 1916–1918
 * General Sir William Peyton 1918
 * General Sir William Birdwood 1918