Special bomb-proof covers for the local reserves were also constructed at various points, and the ground in front ruthlessly cleared of houses, barns, trees, hedges, and everything that might afford shelter to an advancing enemy. Every possible military obstacle was placed in front of the lines that time permitted, abattis, military pits, wire entanglements, and small ground mines. At the more important points along the fifty miles of entrenchments
field-works and redoubts for infantry and guns were built, most of them being armed with 4.7 or even 6 and 7.5 in. guns, which had been brought from Woolwich, Chatham, Portsmouth, and Devonport, and mounted on whatever carriages could be adapted or improvised for the occasion.
The preparation of the London lines was a stupendous undertaking, but the growing scarceness and dearness of provisions assisted in a degree, as no free rations were issued to any able-bodied man unless he went out to work at the fortifications. All workers were placed under military law. There were any number of willing workers who proffered their services in this time of peril. Thousands of men came forward asking to be enlisted and armed. The difficulty was to find enough weapons
