Whilst Bruce Hamilton was operating so successfully in the Ermelo district, several British columns under Plumer, Spens, and Colville were stationed some fifty miles south to prevent the fugitives from getting away into the mountainous country which lies to the north of Wakkerstroom. On January 3rd a small force of Plumer's New Zealanders had a brisk skirmish with a party of Boers, whose cattle they captured, though at some loss to themselves. These Boers were strongly reinforced, however, and when on the following day Major Vallentin pursued them with fifty men he found himself at Onverwacht in the presence of several hundred of the enemy, led by Oppermann and Christian Botha. Vallentin was killed and almost all of his small force were hit before British reinforcements, under Colonel Pulteney, drove the Boers off. Nineteen killed and twenty-three wounded were our losses in this most sanguinary little skirmish. Nine dead Boers, with Oppermann himself, were left upon the field of battle. His loss was a serious one to the enemy, as he was one of their most experienced Generals.