It may well be asked how for so long a period as seventeen days the British could tolerate a force to the rear of them when with their great superiority of numbers they could have readily sent an army to drive it away. The answer must be that Lord Roberts had despatched his trusty lieutenant, Kitchener, to Aliwal, whence he had been in heliographic communication with Wepener, that he was sure that the place could hold out, and that he was using it, as he did Kimberley, to hold the enemy while he was making his plans for their destruction. This was the bait to tempt them to their ruin. Had the trap not been a little slow in closing, the war in the Free State might have ended then and there. From the 9th to the 25th the Boers were held in front of Wepener. Let us trace the movements of the other British detachments during that time.
Brabant\'s force, with Hart\'s brigade, which had been diverted on its way to Kimberley, where it was to form part of Hunter\'s division, was moving on the south towards Wepener, advancing through Rouxville, but going slowly for fear of scaring the Boers away before they were sufficiently compromised. Chermside\'s 3rd division approached from the north-west, moving out from the railway at Bethany, and passing through Reddersberg towards Dewetsdorp, from which it would directly threaten the Boer line of retreat. The movement was made with reassuring slowness and gentleness, as when the curved hand approaches the unconscious fly. And then suddenly, on April 21st, Lord Roberts let everything go. Had the action of the agents been as swift and as energetic as the mind of the planner, De Wet could not have escaped us.
What held Lord Roberts\'s hand for some few days after he was ready to strike was the abominable weather. Rain was falling in sheets, and those who know South African roads, South African mud, and South African drifts will understand how impossible swift military movements are under those circumstances. But with the first clearing of the clouds the hills to the south and east of Bloemfontein were dotted with our scouts. Rundle with his 8th division was brought swiftly up from the south, united with Chermside to the east of Reddersberg, and the whole force, numbering 13,000 rifles with thirty guns, advanced upon Dewetsdorp, Rundle, as senior officer, being in command. As they marched the blue hills of Wepener lined the sky some twenty miles to the south, eloquent to every man of the aim and object of their march.
On April 20th, Rundle as he advanced found a force with artillery across his path to Dewetsdorp. It is always difficult to calculate the number of hidden men and lurking guns which go to make up a Boer army, but with some knowledge of their total at Wepener it was certain that the force opposed to him must be very inferior to his own. At Constantia Farm, where he found them in position, it is difficult to imagine that there were more than three thousand men. Their left flank was their weak point, as a movement on that side would cut them off from Wepener and drive them up towards our main force in the north. One would have thought that a containing force of three thousand men, and a flanking movement from eight thousand, would have turned them out, as it has turned them out so often before and since. Yet a long-range action began on Friday, April 20th, and lasted the whole of the 21st, the 22nd, and the 23rd, in which we sustained few losses, but made no impression upon the enemy. Thirty of the 1st Worcesters wandered at night into the wrong line, and were made prisoners, but with this exception the four days of noisy fighting does not appear to have cost either side fifty casualties. It is probable that the deliberation with which the operations were conducted was due to Rundle\'s instructions to wait until the other forces were in position. His subsequent movements showed that he was not a General who feared to strike.
On Sunday night (April 22nd) Pole-Carew sallied out from Bloemfontein on a line which would take him round the right flank of the Boers who were facing Rundle. The Boers had, however, occupied a strong position at Leeuw Kop, which barred his path, so that the Dewetsdorp Boers were covering the Wepener Boers, and being in turn covered by the Boers of Leeuw Kop. Before anything could be done, they must be swept out of the way. Pole-Carew is one of those finds which help to compensate us for the war. Handsome, dashing, debonnaire, he approaches a field of battle as a light-hearted schoolboy approaches a football field. On this occasion he acted with energy and discretion. His cavalry threatened the flanks of the enemy, and Stephenson\'s brigade carried the position in front at a small cost. On the same evening General French arrived and took over the force, which consisted now of Stephenson\'s and the Guards brigades (making up the 11th division), with two brigades of cavalry and one corps of mounted infantry. The next day, the 23rd, the advance was resumed, the cavalry bearing the brunt of the fighting. That gallant corps, Roberts\'s Horse, whose behaviour at Sanna\'s Post had been admirable, again distinguished itself, losing among others its Colonel, Brazier Creagh. On the 24th again it was to the horsemen that the honour and the casualties fell. The 9th Lancers, the regular cavalry regiment which bears away the honours of the war, lost several men and officers, and the 8th Hussars also suffered, but the Boers were driven from their position, and lost more heavily in this skirmish than in some of the larger battles of the campaign. The \'pom-poms,\' which had been supplied to us by the belated energy of the Ordnance Department, were used with some effect in this engagement, and the Boers learned for the first time how unnerving are those noisy but not particularly deadly fireworks which they had so often crackled round the ears of our gunners.
On the Wednesday morning Rundle, with the addition of Pole-Carew\'s division, was strong enough for any attack, while French was in a position upon the flank. Every requisite for a great victory was there except the presence of an enemy. The Wepener siege had been raised and the force in front of Rundle had disappeared as only Boer armies can disappear. The combined movement was an admirable piece of work on the part of the enemy. Finding no force in front of them, the combined troops of French, Rundle, and Chermside occupied Dewetsdorp, where the latter remained, while the others pushed on to Thabanchu, the storm centre from which all our troubles had begun nearly a month before. All the way they knew that De Wet\'s retreating army was just in front of them, and they knew also that a force had been sent out from Bloemfontein to Thabanchu to head off the Boers. Lord Roberts might naturally suppose, when he had formed two cordons through which De Wet must pass, that one or other must hold him. But with extraordinary skill and mobility De Wet, aided by the fact that every inhabitant was a member of his intelligence department, slipped through the double net which had been laid for him. The first net was not in its place in time, and the second was too small to hold him.
While Rundle and French had advanced on Dewetsdorp as described, the other force which was intended to head off De Wet had gone direct to Thabanchu. The advance began by a movement of Ian Hamilton on April 22nd with eight hundred mounted infantry upon the waterworks. The enemy, who held the hills beyond, allowed Hamilton\'s force to come right down to the Modder before they opened fire from three guns. The mounted infantry fell back, and encamped for the night out of range [12] . Before morning they were reinforced by Smith-Dorrien\'s brigade (Gordons, Canadians, and Shropshires – the Cornwalls had been left behind) and some more mounted Infantry. With daylight a fine advance was begun, the brigade moving up in very extended order and the mounted men turning the right flank of the defence. By evening we had regained the waterworks, a most important point for Bloemfontein, and we held all the line of hills which command it. This strong position would not have been gained so easily if it had not been for Pole-Carew\'s and French\'s actions two days before, on their way to join Rundle, which enabled them to turn it from the south.