From Johannesburg to Pretoria the distance is about thirty miles by road. East and west of Johannesburg for some 100 miles runs the Witwatersrand ridge, which commands the town and offers a strong position against any enemy advancing from the south. At Boksburg, on the east, are various natural redoubts of rubbish heaps thrown up from the mines, whose hideous chimneys rise clear against the cloudy atmosphere of the swarming city. Further on comes a species of desert, dotted now and then with a green oasis, and sliced with valleys wrinkled with undulating ridges, and beyond that, Pretoria. The town sits, so to speak, in the lap of hills, each hill crowned with forts, of which the two most formidable faced south, as menace to all invaders. The natural disposition of the surrounding heights makes it possible for a small force to resist a strong one with comparative ease. On the north a girdle of eminences, each a rocky and frowning fortress, renders approach in face of the enemy well-nigh impossible. Beyond Six-Mile Spruit, which lies some twenty-six miles from the Rand, and six from the capital, are three more frowning ridges, natural strongholds. And these it was necessary to assail. Both Schanzkop to west and Klapperkop to east of the line looked gaunt and ominous, the very fire and sword of the cherubim, and the approaches were charred black by intentional veldt fires so as to serve as blackboards to throw up any demonstrations in chalk-grey kharki. It was here, nevertheless, that the chief had decided to make his entry to Pretoria, keeping the direct Johannesburg road, and avoiding if possible the more dangerous of the fortified positions. On the 3rd of June the great march was resumed. The army moved in three columns--the Cavalry Division under General French on the left, General Ian Hamilton's force in the centre, the main column, consisting of Pole-Carew's Division and Maxwell's Brigade of Tucker's Division (General Wavell's Brigade was left to hold Johannesburg), Gordon's Cavalry Brigade (covering the eastern flank) and the corps troops under the chief's direct command bearing towards the line of rail as described. Colonel Henry, with Ross's Mounted Infantry, Compton's Horse, the Sussex Yeomanry, the Victorian Rifles, the Colt Battery, and J Horse Battery, formed the advance guard of the main column, while Colonel de Lisle's 6th Mounted Infantry formed the advance guard of General Ian Hamilton's Division.