Meanwhile both cavalry and artillery in great bodies, and strings of motor-omnibuses filled with troops, were upon the white, dusty roads passing through Staines to Hounslow and Brentford, thence to London, St. Albans, _en route_ to their respective divisions. Roughly, the distance was over fifty miles, therefore those marching were compelled to halt the night on the way, while those in the motor-omnibuses got through to their destination. To cavalry, thirty-five miles is a long day’s march, and in view of the heavy work before them, stringent orders had been given them to spare the horses as much as possible. The heads of the columns did not, therefore, pass beyond Hounslow on the first night, and in that neighbourhood the thousands of all ranks made themselves as comfortable as circumstances would permit. The majority of the men were fed and billeted by the all-too-willing inhabitants, and upon their hot march they met with ovations everywhere. At last we were defending ourselves! The sight of British troops hurrying to the front swelled the hearts of the villagers and townsfolk with renewed patriotism, and everywhere, through the blazing, dusty day, the men were offered refreshment by even the poorest and humblest cottagers. In Bagshot, in Staines, and in Hounslow the people went frantic with excitement, as squadron after squadron rapidly passed along, with its guns, wagons, and ambulances rumbling noisily over the stones, in the rear. Following these came pontoon troops with their long grey wagons and mysterious-looking bridging apparatus, telegraph troops, balloon sections, supply columns, field bakery, and field hospitals, the last-named packed in wagons marked with the well-known red cross of the Geneva Convention. No sooner was Aldershot denuded of its army corps, however, than battalions began to arrive from Portsmouth on their way north, while troops from the great camp on Salisbury Plain were rapidly being pushed to the front, which, roughly speaking, extended through Hitchin, Royston, to Saffron Walden, across to Braintree, and also the high ground commanding the valley of the Colne to Colchester. The line chosen by the General Staff was the natural chain of hills which presented the first obstacle to the enemy advancing on London from the wide plain stretching eastward beyond Cambridge to the sea. If this could be held strongly, as was intended, by practically the whole of the British forces located in the South of England, including the Yeomanry, Militia, and Volunteers--who were now all massing in every direction--then the deadly peril threatening England might be averted. But could it be held?