Preparations were at once made with the utmost secrecy and dispatch, and before the Russians had more than an inkling of what was on foot, Germany was ready to strike. Never before in the history of the world have so many guns and men been so silently and swiftly brought up to an enemy's front. The secret was wonderfully kept. Train after train heavily laden with hundreds of big guns and three-quarters of all the shells that had been made in the busy munition factories of Germany during the winter was hurried to Galicia, and soon the new depots erected near the Donajetz were full to overflowing. Then followed many pontoons and much bridging material, for many rivers would have to be crossed on the line of the proposed advance. New hospital stations were established, a network of telegraph lines was erected, and great herds of cattle for feeding the armies were penned behind the German lines. Then, with the same speed and secrecy, masses of troops were hurried into Galicia, and before long there were two millions of men between Bukovina and Cracow. Not until everything was ready did Dmitrieff discover his danger. The plan of campaign was as follows. Von Mackensen was to be provided with not less than 1,500 guns and ten army corps, and with these he was to batter his way through the Russian lines. He meant to overwhelm the Russian trenches by means of a hurricane of artillery fire, and then thrust forward his men in close order, wave after wave, and drive the broken and dazed enemy before him. He was going to do what we had done at Neuve Chapelle, but he had far better prospects of success, for the Russians had neglected to prepare second and third lines of defence, and they were woefully deficient in artillery, rifles, and ammunition. Once he could get the Russians on the run he might envelop and utterly destroy them. At any rate, he would hurl them back to the river San. [Illustration: The Russian Retreat from the Donajetz to the San.] This map shows you the Russian line on 28th April. By this time Dmitrieff was aware that a mighty force of Germans was in front of him. He sent an urgent message to Ivanov, begging for two corps as reinforcements; but by some mistake the message never reached headquarters, and he was forced to meet the terrible thrust of the enemy with only his winter strength.