The British government took these defeats badly and with the sieges still continuing was compelled to send two more divisions plus large numbers of colonial volunteers. By January 1900 this would become the largest force Britain had ever sent overseas, amounting to some 180,000 men with further reinforcements being sought.
The Battle of Spion Kop was fought about 38 km (24 mi) west-south-west of Ladysmith on the hilltop of Spioenkop along the Tugela River, Natal in South Africa from 23–24 January 1900. It was fought between the South African Republic and the Orange Free State on the one hand and British forces during the Second Boer War campaign to relieve Ladysmith. It resulted in a Boer victory. The battle, collectively with its location at a hill, has gone down in British football lore as the namesake of a common British term for single-tier terraces and/or stands at football stadia.
British troops captured the summit by surprise during the early hours of 24 January 1900, but as the early morning fog lifted they realised too late that they were overlooked by Boer gun emplacements on the surrounding hills. The result was 350 men killed and nearly 1,000 wounded and a retreat across the Tugela River into British territory. There were nearly 300 Boer casualties.
In January 1900, Churchill briefly rejoined the army as a lieutenant in the South African Light Horse regiment, joining Redvers Buller's fight to relieve the Siege of Ladysmith and take Pretoria. He was among the first British troops in both places. He and his cousin, the 9th Duke of Marlborough, demanded and received the surrender of 52 Boer prison camp guards. Throughout the war, he had publicly chastised anti-Boer prejudices, calling for them to be treated with "generosity and tolerance", and after the war, he urged the British to be magnanimous in victory.