The longest blockhouse line, which was, however, not completed until a few weeks before the end of the war, extended from Victoria Road Station to Lambert's Bay on the Atlantic, a distance of 300 miles. In the vicinity of Johannesburg, and in the Central districts of the Orange River Colony west of the railway, cordons of posts manned by the South African Constabulary took the place of blockhouse lines. These posts, which were established at wider intervals apart than the blockhouses, were intended to act as bases for minor clearing operations. They offered little or no obstruction to a Boer commando on trek. The blockhouse lines were resolutely extended by Lord Kitchener in every direction; and by the end of the war there was scarcely a district in the spacious area of hostilities that was not impaled upon them or helplessly clutched in their fatal grasp. The "Drive" as a military weapon is as old as the time of Darius. The first use of it in South Africa, on a large scale, was French's movement through the Eastern Transvaal in February, 1901.[56] The "Drive" has been criticized as an awkward attempt to perform, with one and the same force, two distinct operations of war; namely, the coercion of the non-military population and the defeat of the enemy's troops. The dual task deprives the force set to it of mobility and power of initiative. As a detail of abstract and orthodox military criticism the objection is sound; but it ignores the special local circumstances of the case. In the vast area on which the British Army was operating it was not possible to separate the two objectives. Moreover, the purely military resources of the enemy were waning; and the contest was resolving itself into an effort to put pressure on the country at large, rather than to smash the dwindling, evasive, and centrifugal commandos in the field. French's "drive," from a military point of view, was not a success; but it at least frightened Botha and the Transvaal Government. In May, 1901, there was a conference near Ermelo at which it was resolved that overtures should be made to Lord Kitchener; and but for Steyn, who was communicated with in the Orange River Colony, and who had had no experience of the "drive," it is probable that negotiations for peace would have ensued. On the other hand, the "drive" has been approved as a method of warfare particularly adapted for use by an army deficient in mobility and incapable of acquiring accurate intelligence of the enemy. * * * * *