Graf Spee had sailed into the South Atlantic in August 1939, before the war began, and had begun commerce raiding after receiving the appropriate authorisation on 26 September 1939.[5] Harwood's squadron was one of several search groups sent in pursuit by the British Admiralty and sighted Graf Spee off the estuary of the River Plate (a.k.a. the Río de la Plata) near the coasts of Argentina and Uruguay.[6]
In the ensuing battle, Exeter was severely damaged and forced to retire, making for the Falklands; Ajax and Achilles suffered moderate damage. Damage to Graf Spee, although not extensive, was critical because her fuel system was crippled. Ajax and Achilles shadowed the German ship until she entered the port of Montevideo, the capital of neutral Uruguay, to effect urgent repairs. Langsdorff was told that his stay could not be extended beyond 72 hours. Apparently believing that the British had gathered a superior force to await his departure, he ordered for the ship to be scuttled.[7][8][9] Langsdorff then committed suicide three days later.[10][11]