Order of battle at Mons
The following units of the German First Army and British Expeditionary Force fought in the Battle of Mons in World War I. German First Army. First Army, commanded by Generaloberst Alexander von Kluck II Army Corps. 3rd Infantry Division 4th Infantry Division III Army Corps. 5th Infantry Division 6th Infantry Division IV Army Corps. 7th Infantry Division 8th Infantry Division IX Army Corps. 17th Infantry Division 18th Infantry Division III Reserve Corps. 5th Reserve Division 6th Reserve Division IV Reserve Corps. 7th Reserve Division 22nd Reserve Division "10th Mixed Landwehr Brigade" "11th Mixed Landwehr Brigade  27th Landwehr Brigade" Composite Landwehr Cavalry Unit (3 squadrons) Composite Lansturm Artillery Unit (2 batteries) Army Troops British Expeditionary Force. British Expeditionary Force, commanded by Field Marshal Sir John French Army Troops Line of communications defence troops I Corps. I Corps, commanded by Lieutenant-General Douglas Haig 1st Division (Lomax) 2nd Division (Monro) II Corps. II Corps, commanded by General Horace Smith-Dorrien 3rd Division (Hamilton) 5th Division (Fergusson) Cavalry Division. Cavalry Division, commanded by Major-General Edmund Allenby Royal Flying Corps in the Field. Royal Flying Corps, commanded by Brigadier-General David Henderson Order of battle at Mons The