During the early months of the year 1901 Viljoen for the most part contented himself with frequent attacks on the Delagoa Bay Railway, and a vigorous effort to restrain his activity was not practicable. In March Lord Kitchener formulated a plan for the subjugation of the Northern Transvaal. His plan was to send a column with secrecy and dispatch to Pietersburg, which would be occupied as a base from which the column would work southwards along the line of the Olifant's River, in co-operation with columns acting northwards from the Delagoa Bay Railway. The force selected to proceed to Pietersburg was Plumer's Australian column, which sixteen days after it desisted from the chase of De Wet in the Orange River Colony was marching northwards out of Pretoria. Plumer entered Pietersburg on April 8 without opposition, Beyers, who had been falling back before him from Warmbaths, having evacuated the town. Plumer halted for a few days in order to secure the railway and to make arrangements for carrying out his orders to hold the line of the Olifant's River. Before the end of the month he was in possession of all the drifts from Commissie Drift downwards, and denied them to Viljoen. The country in which Viljoen was acting is hilly and intricate, and Lord Kitchener, by borrowing Sir Bindon Blood from the Indian Government, an officer of great experience in frontier _guerilla_, paid Viljoen and the Boer commandos the compliment of crediting them with the military qualities of the dangerous, predatory, and enterprising hill tribes of the underfeatures of the Himalayas. To Blood were given six columns which were to work from Lydenburg and the Delagoa Bay Railway. Viljoen was near Ros Senekal. He had three lines of retreat, northward or southward along the Steelpoort River, or down the Blood River. Blood's columns were disposed with the object of closing these exits. The Transvaal Government, which for some months had been sojourning in security at Paardeplatz, fled and joined Botha near Ermelo; but Viljoen stood fast. The total force under Blood exceeded 10,000 men. Three columns under Beatson, Benson, and Pulteney, who had joined from Vryheid where he had been serving under French's command, advanced northwards from the Delagoa Bay Railway. On their right front they were supported by three columns acting from Lydenburg, under Park, W. Douglas, and W. Kitchener. Douglas was the only leader destined to encounter Viljoen, who on April 10 struck at him near Dullstroom, but was handsomely beaten and compelled to return to the place from which he came. He was hedged in on all sides; mutiny and disaffection were rife among his burghers; and he saw that there was nothing to be done but make his escape as best he could.