Roberts had prepared the way by clearing out the south-eastern corner of the State, and at the moment of his advance his forces covered a semicircular front of about forty miles, the right under Ian Hamilton near Thabanchu, and the left at Karee. This was the broad net which was to be swept from south to north across the Free State, gradually narrowing as it went. The conception was admirable, and appears to have been an adoption of the Boers' own strategy, which had in turn been borrowed from the Zulus. The solid centre could hold any force which faced it, while the mobile flanks, Hutton upon the left and Hamilton upon the right, could lap round and pin it, as Cronje was pinned at Paardeberg. It seems admirably simple when done upon a small scale. But when the scale is one of forty miles, since your front must be broad enough to envelop the front which is opposed to it, and when the scattered wings have to be fed with no railway line to help, it takes such a master of administrative detail as Lord Kitchener to bring the operations to complete success.