The Battle of Modder River (known in Afrikaans as Slag van die Twee Riviere, which translates as "Battle of the two rivers") was an engagement in the Boer War, fought at Modder River, on 28 November 1899. A British column under Lord Methuen, that was attempting to relieve the besieged town of Kimberley, forced Boers under General Piet Cronje to retreat to Magersfontein, but suffered heavy casualties themselves.