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.
As the British troops came within 1,200 yards (1,100 m) of the river, Methuen remarked to Colville, "They're not here." Colville replied, "They're sitting uncommonly tight if they are". At this point the Boers opened fire. Most of the British troops were forced to throw themselves flat. Some tried to advance in short rushes, but could find no cover on the veld. Few British troops got closer than 1,000 yards (910 m) to the Boers. The Guards tried to outflank the Boer left, but were unable to ford the Riet River. The British guns pounded the buildings near Modder River Station and the line of poplar trees which marked the north bank of the Modder, and entirely missed the enemy trenches on the south bank. Meanwhile, the Boer guns maintained a galling fire, and kept in action by repeatedly moving their positions.
The battle became a day-long stalemate. Most of the British infantry lay prone on the veld, tortured by heat and thirst, but safe from enemy fire unless they moved. Many stoically smoked pipes or even slept. Methuen galloped about the field trying to renew the advance, and was himself wounded. At midday, some of Pole-Carew's 9th Brigade found the open Boer right flank at Rosmead drift (ford) downstream. British infantry infiltrated across the ford and about 1:00 pm drove the Boers out of Rosmead. The attack was disjointed, and suffered casualties when a British field artillery battery (62nd) which had just arrived on the field shelled them by mistake. By nightfall, De la Rey had driven them back into a small insecure bridgehead.
Nevertheless, the Boers feared that they were now vulnerable to being outflanked, and withdrew during the night.