Second Boer War - Second Phase: The British Offensive of January To September 1900

Second Phase: The British Offensive of January To September 1900

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.

While watching for these reinforcements, Buller made another bid to relieve Ladysmith by crossing the Tugela west of Colenso. Buller's subordinate, Major General Charles Warren, successfully crossed the river, but was then faced with a fresh defensive position centred on a prominent hill known as Spion Kop. In the resulting Battle of Spion Kop, 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 rest of the day resulted in a disaster caused by poor communication between Buller and his commanders. Between them they issued contradictory orders, on the one hand ordering men off the hill, while other officers ordered fresh reinforcements to defend it. The result was 350 men killed and nearly 1,000 wounded and a retreat back across the Tugela River into British territory. There were nearly 300 Boer casualties.

Buller attacked Louis Botha again on 5 February at Vaal Krantz and was again defeated. Buller withdrew early when it appeared that the British would be isolated in an exposed bridgehead across the Tugela, and was nicknamed "Sir Reverse" by some of his officers.

By taking command in person in Natal, Buller had allowed the overall direction of the war to drift. Because of concerns about his performance and negative reports from the field, he was replaced as Commander in Chief by Field Marshal Lord Roberts. Like Buller, Roberts first intended to attack directly along the Cape Town – Pretoria railway but, again like Buller, was forced to relieve the beleaguered garrisons. Leaving Buller in command in Natal, Roberts massed his main force near the Orange River and along the Western Railway behind Methuen's force at the Modder River, and prepared to make a wide outflanking move to relieve Kimberley.

Except in Natal, the war had stagnated. Other than a single attempt to storm Ladysmith, the Boers made no attempt to capture the besieged towns. In the Cape Midlands, the Boers did not exploit the British defeat at Stormberg, and were prevented from capturing the railway junction at Colesberg. In the dry summer, the grazing on the veld became parched, weakening the Boers' horses and draught oxen, and many Boer families joined their menfolk in the siege lines and laagers (encampments), fatally encumbering Cronje's army.

Roberts launched his main attack on 10 February 1900 and although hampered by a long supply route, managed to outflank the Boers defending Magersfontein. On 14 February, a cavalry division under Major General John French launched a major attack to relieve Kimberley. Although encountering severe fire, a massed cavalry charge split the Boer defences on 15 February, opening the way for French to enter Kimberley that evening, ending its 124 days’ siege.

Meanwhile, Roberts pursued Piet Cronje’s 7,000-strong force, which had abandoned Magersfontein to head for Bloemfontein. General French’s cavalry was ordered to assist in the pursuit by embarking on an epic 30-mile drive towards Paardeberg where Cronje was attempting to cross the Modder River. At the Battle of Paardeberg from 18 to 27 February, Roberts then surrounded General Piet Cronje's retreating Boer army. On 17 February, a pincer movement involving both French’s cavalry and the main British force attempted to take the entrenched position, but the frontal attacks were uncoordinated and so were easily repulsed by the Boers. Finally, Roberts resorted to bombarding Cronje into submission, but it took a further ten precious days and with the British troops using the polluted Modder River as water supply, resulting in a typhoid epidemic killing many troops. General Cronje was forced to surrender at Surrender Hill with 4000 men.

In Natal, the Battle of the Tugela Heights, which started on 14 February was Buller's fourth attempt to relieve Ladysmith. Despite reinforcements his progress was painfully slow against stiff opposition. However, on 26 February, after much deliberation, Buller used all his forces in one all-out attack for the first time and at last succeeded in forcing a crossing of the Tugela, and defeated Botha's outnumbered forces north of Colenso. After a siege lasting 118 days, the Relief of Ladysmith was effected, the day after Cronje surrendered, but at a total cost of 7,000 British casualties.

After a succession of defeats, the Boers realised that against such overwhelming superiority of troops, they had little chance of defeating the British and so became demoralised. Roberts then advanced into the Orange Free State from the west, putting the Boers to flight at the Battle of Poplar Grove and capturing Bloemfontein, the capital, unopposed on 13 March with the Boer defenders escaping and scattering. Meanwhile, he detached a small force to relieve Baden-Powell, and the Relief of Mafeking on 18 May 1900 provoked riotous celebrations in Britain.

On 28 May, the Orange Free State was annexed and renamed the Orange River Colony.

After being forced to delay for several weeks at Bloemfontein due to a shortage of supplies and enteric fever (caused by poor hygiene, drinking bad water at Paardeburg and appalling medical care), Roberts resumed his advance. He was forced to halt again at Kroonstad for 10 days, due once again to the collapse of his medical and supply systems, but finally captured Johannesburg on 31 May and the capital of the Transvaal, Pretoria, on 5 June. The first into Pretoria, was Lt. William Watson of the New South Wales Mounted Rifles, who persuaded the Boers to surrender the capital. (Before the war, the Boers had constructed several forts south of Pretoria, but the artillery had been removed from the forts for use in the field, and in the event the Boers abandoned Pretoria without a fight).

This allowed the Roberts to declare the war over, having won the principal cities and so, on 3 September 1900, the South African Republic was formally annexed.

British observers believed the war to be all but over after the capture of the two capital cities. However, the Boers had earlier met at the temporary new capital of the Orange Free State, Kroonstad, and planned a guerrilla campaign to hit the British supply and communication lines. The first engagement of this new form of warfare was at Sanna's Post on 31 March where 1,500 Boers under the command of Christiaan De Wet attacked Bloemfontein's waterworks about 23 miles (37 km) east of the city, and ambushed a heavily escorted convoy, which caused 155 British casualties and the capture of seven guns, 117 wagons, and 428 British troops.

After the fall of Pretoria, one of the last formal battles was at Diamond Hill on 11 – 12 June, where Roberts attempted to drive the remnants of the Boer field army beyond striking distance of Pretoria. Although Roberts drove the Boers from the hill, the Boer commander, Louis Botha, did not regard it as a defeat, for he inflicted more casualties on the British (totalling 162 men) while suffering around 50 casualties.

The set-piece period of the war now largely gave way to a mobile guerrilla war, but one final operation remained. President Kruger and what remained of the Transvaal government had retreated to eastern Transvaal. Roberts, joined by troops from Natal under Buller, advanced against them, and broke their last defensive position at Bergendal on 26 August. As Roberts and Buller followed up along the railway line to Komatipoort, Kruger sought asylum in Portuguese East Africa (modern Mozambique). Some dispirited Boers did likewise, and the British gathered up much war material. However, the core of the Boer fighters under Botha easily broke back through the Drakensberg mountains into the Transvaal highveld after riding north through the bushveld. Under the new conditions of the war, heavy equipment was no use to them, and therefore no great loss.

As Roberts's army occupied Pretoria, the Boer fighters in the Orange Free State had been driven into a fertile area known as the Brandwater Basin in the north east of the Republic. This offered only temporary sanctuary, as the mountain passes leading to it could be occupied by the British, trapping the Boers. A force under General Archibald Hunter set out from Bloemfontein to achieve this in July 1900. The hard core of the Free State Boers under Christiaan De Wet, accompanied by President Steyn, left the basin early. Those remaining fell into confusion and most failed to break out before Hunter trapped them. 4,500 Boers surrendered and much equipment was captured but as with Roberts's drive against Kruger at the same time, these losses were of relatively little consequence, as the hardcore of the Boer armies and their most determined and active leaders remained at large.

From the Basin, Christiaan De Wet headed west. Although hounded by British columns, he succeeded in crossing the Vaal into western Transvaal, to allow Steyn to travel to meet the Transvaal leaders.

There was much sympathy for the Boers on mainland Europe and in October, President Kruger and members of the Transvaal government left Portuguese East Africa on the Dutch warship De Gelderland, sent by the Queen of the Netherlands Wilhelmina, who had simply ignored the British naval blockade of South Africa. Paul Kruger's wife, however, was too ill to travel and remained in South Africa where she died on 20 July 1901 without seeing her husband again. President Kruger first went to Marseille and then on to The Netherlands where he stayed for a while before moving finally to Clarens, Switzerland, where he died in exile on 14 July 1904.