Advance on Pretoria
Part of the Second Boer War
The Battle of Doornkop, a major battle of the Advance on Pretoria
Date 3 May - 8 June 1900 Location Orange Free State and Transvaal Result British Victory
Belligerents
British Empire  United Kingdom  Canada New Zealand  Queensland  Victoria  Western Australia  South Australia  Tasmania New South Wales  Ceylon	South African Republic  Orange Free State
Commanders and leaders
Lord Roberts John French Redvers Buller Lord Methuen Charles Tucker Ian Hamilton Thomas Kelly-Kenny Reginald Pole-Carew	Louis Botha Paul Kruger Koos de la Rey Christiaan de Wet

The Advance on Pretoria was a military operation during the Second Boer War. From May–June 1900, Lord Roberts and his force began a strategic offensive from Bloemfontein to Pretoria, with the goal of capturing the Pretoria, the capital of the South African Republic (Transvaal) in hopes of ending the war, and forcing the Boers into surrendering. After the clearing of the South East of the Orange Free State, Lord Roberts began his offensive on 3 May 1900, gathering a force around 40,000-50,000 strong.^[1] The Army formed three lines of advance. On the far left, a force commanded by Lord Methuen advanced from Boshof, in the center, Lord Roberts led the main army up the railway from Bloemfontein to Pretoria, and on the right, Redvers Buller led an army up through Northern Natal from Ladysmith to Pretoria. The military operation was a success, with British Forces entering Pretoria on 5 June, and the Boers surrendering the capital shortly after. On 8 June, the country was annexed, and formed into the Transvaal Colony in 1902. Methuen managed to clear the Orange Free State, and had a force relieve Mafeking whilst doing so.

The main Advance from Bloemfontein began on 3 May, with the British moving out from Karee Siding, the site of a previous battle. His force advanced mainly up the railway lines, with cavalry and mounted rifles being placed on the fringes, and the infantry being in the center. Resistance was encountered on 10 May, where the British Forces found that the railway bridge at Sand River had been blown up. A Boer defensive position was discovered nearby. At the Battle of Zand River, a force of cavalry led by General French, along with a force of infantry, forced the Boers from their position. Roberts resumed the advance, with the Boers stationed north of them at Kroonstad, the new capital of the O.F.S. However, on 12 May, Roberts' forced marched into the town without resistance, and the Boer leaders in control had fled. Roberts' force halted here for 8 days to recuperate, before continuing on 20 May. On 21 May, Roberts occupied Ladybrand, and crossed the Vaal River on the 26 May, officially entering the Transvaal. On 28 May, the troops passed Klip River with no resistance. On 29 May, the force encountered resistance at Doornkop. In the following Battle, lasting into the next day, the British repulsed the Boer forces present, and Louis Botha was forced to withdraw again. On 31 May, British troops occupied Johannesburg, beginning the last stage of the advance.^[2]

British cavalry blew up the railway line from Deloga to Pretoria, and quickly began moving in to surround the enemy capitol. On 2 June, Roberts' force moved out, expecting resistance from the Pretoria Forts, however none such resistance came, and by 4 June, all fighting and skirmishing ceased. On 5 June, the Coldstream Guards marched into Pretoria unopposed, and the capitol was surrendered to the British.^[3][1]

Whilst Lord Roberts was advancing from Bloemfontein, General Buller was busy clearing Northern Natal, which was still laden with Boers, even after the Siege of Ladysmith had ended in February. He had advanced from Ladysmith to Newcastle, and by May 1900, had cleared most of Natal of the Boers. The final and most major actions were the Battle of Laing's Nek, and the Battle of Botha's Pass in June 1900. Eventually, Buller was able to repulse the Boers, and push into the Transvaal, crossing the border on June 12, 1900.^[1][4][5]