I determined to go into Aba el Lissan with the armoured cars, for Buxton was now on proved ground among friends, and could do without my help. So we drove fast down the scarp to the Jefer flat, and skipped across it at sixty miles an hour, ourselves the leading car. We threw up such a dust-cloud that we lost our sister, and when we reached the south edge of the flat she was nowhere visible. Probably tyre trouble, so we sat down to wait, gazing back into the dappled waves of mirage which streamed over the ground. Their dark vapour, below the pale sky (which got more and more blue as it went higher) shifted a dozen times in the hour, giving us a false alarm of our coming friends; but at last, through the greyness, came spinning a black spot wagging a long trail of sun-shining dust.

This was Greenhill tearing after, at speed through the shrivelling air, which eddied about his burning metal turret, making it so hot that its naked steel seared the bare arms and knees of the crew whenever the huge car lurched in the soft heat-powdered ground, whose carpeted dust lay waiting for the low autumn wind to sweep it across the open in a blinding choking storm.