21-24 August 1914
This is the first major battle for British forces in World War I, and actually the first major action involving the British Army in Western Europe since the Battle of Waterloo in 1815.
Part of the series of actions know as the Battle of the Frontiers, saw the British attempt to hold the line of the Mons-Conde Canal against the advance of the German 1st Army. Heavily outnumbered, the British managed to inflict significant casualties before they were forced to withdraw. The ‘Great Retreat’ followed and would continue (over 400km) until the British had almost reached Paris two weeks later.