The French had won some ground in the region of the Lorette plateau early in 1915. The Tenth Army in the Artois received enough additional men to give it seven corps. More than 1,100 pieces of artillery, of varying caliber, were taken to this region by the French. The entire preparation for the campaign was under the personal direction of General Foch. In the meantime the Germans, becoming aware that their enemy was becoming more and more active, proceeded to strengthen the front by the addition of three divisions which were known as "divisions of assault." The men composing these additions were from Bavaria, Saxony, and Baden. Even this reenforcement left the Teutons outnumbered, and with less artillery than their opponents; but they held a position which was considered more impregnable than any other on either front. The Germans here had a chain of forts linked together by an elaborate series of trenches, these latter so arranged that the taking of one of the series placed its captors within the zone of fire of several others. Moreover there was an elaborate series of underground works, including mines and wolf pits, the latter being covered over with a thin layer of turf and thickly studded with stakes whose points awaited the charging French. General Foch was ready on Sunday morning, May 9, 1915, and his artillery began one of the heaviest bombardments in history. The 1,100 French cannon hurled 300,000 shells on the German fortifications that day. The reverberations were deafening and terrifying. They startled the British engaged at the Aubers Ridge. The deluge of projectiles crashed their way through the supposedly impregnable work of engineering that the Germans had erected, and buried their mangled defenders in chaotic ruins. The preliminary work of the artillery was continued for three hours, accompanied by the plaudits of the French infantrymen. Then the infantry were sent to take the wrecks of what had been the pride of the German engineers. They took what was still in existence at La Targette, and the important crossroads there. They waged a fierce fight in and around the village of Neuville St. Vaast, which was stoutly defended by German machine guns. Here there was house-to-house fighting. The French center, farther north, charged over the remnants of the White Works, and went on beyond the Arras-Bethune road. This section of the advance took more than two and a half miles of trenches in an hour and a half. On the left the French were unable to maintain such speed, because of the many ravines. They took the outlying sections of Carency, and worked their way eastward, cutting the road to Souchez. At the end of the first day the French had to their credit three lines of German trenches on a five-mile front, 3,000 prisoners, 10 field guns, and 50 machine guns.