To the north of Pretoria a second force was acting under Grobler, while a third under De la Rey had been despatched secretly across to the left wing of the British, north-west of Pretoria. While Botha engaged the attention of Lord Roberts by energetic demonstrations on his right, Grobler and De la Rey were to make a sudden attack upon his centre and his left, each point being twelve or fifteen miles from the other. It was well devised and very well carried out; but the inherent defect of it was that, when subdivided in this way, the Boer force was no longer strong enough to gain more than a mere success of outposts.
De la Rey's attack was delivered at break of day on July 11th at Uitval's Nek, a post some eighteen miles west of the capital. This position could not be said to be part of Lord Roberts's line, but rather to be a link to connect his army with Rustenburg. It was weakly held by three companies of the Lincolns with two others in support, one squadron of the Scots Greys, and two guns of O battery R.H.A. The attack came with the first grey light of dawn, and for many hours the small garrison bore up against a deadly fire, waiting for the help which never came. All day they held their assailants at bay, and it was not until evening that their ammunition ran short and they were forced to surrender. Nothing could have been better than the behaviour of the men, both infantry, cavalry, and gunners, but their position was a hopeless one. The casualties amounted to eighty killed and wounded. Nearly two hundred were made prisoners and the two guns were taken.
On the same day that De la Rey made his coup at Uitval's Nek, Grobler had shown his presence on the north side of the town by treating very roughly a couple of squadrons of the 7th Dragoon Guards which had attacked him. By the help of a section of the ubiquitous O battery and of the 14th Hussars, Colonel Lowe was able to disengage his cavalry from the trap into which they had fallen, but it was at the cost of between thirty and forty officers and men killed, wounded, or taken. The old 'Black Horse' sustained their historical reputation, and fought their way bravely out of an almost desperate situation, where they were exposed to the fire of a thousand riflemen and four guns.
On this same day of skirmishes, July 11th, the Gordons had seen some hot work twenty miles or so to the south of Uitval's Nek. Orders had been given to the 19th Brigade (Smith-Dorrien's) to proceed to Krugersdorp, and thence to make their way north. The Scottish Yeomanry and a section of the 78th R.F.A. accompanied them. The idea seems to have been that they would be able to drive north any Boers in that district, who would then find the garrison of Uitval's Nek at their rear. The advance was checked, however, at a place called Dolverkrantz, which was strongly held by Boer riflemen. The two guns were insufficiently protected, and the enemy got within short range of them, killing or wounding many of the gunners. The lieutenant in charge, Mr. A.J. Turner, the famous Essex cricketer, worked the gun with his own hands until he also fell wounded in three places. The situation was now very serious, and became more so when news was flashed of the disaster at Uitval's Nek, and they were ordered to retire. They could not retire and abandon the guns, yet the fire was so hot that it was impossible to remove them. Gallant attempts were made by volunteers from the Gordons--Captain Younger and other brave men throwing away their lives in the vain effort to reach and to limber up the guns. At last, under the cover of night, the teams were harnessed and the two field-pieces successfully removed, while the Boers who rushed in to seize them were scattered by a volley. The losses in the action were thirty-six and the gain nothing. Decidedly July 11th was not a lucky day for the British arms.
It was well known to Botha that every train from the south was bringing horses for Lord Roberts's army, and that it had become increasingly difficult for De Wet and his men to hinder their arrival.