In the meantime, from March 15 to April 17, 1915, the bombardment of Ypres was continued, destroying most of the remaining buildings there. Engagements of importance had not as yet started on the British front. The British had a supply of shrapnel, and the British and French cannon, as well as the rifle- and machine-gun fire, held the Germans in check until they had time to perfect their plans for a vigorous offensive. Nevertheless the British needed a much larger supply of ammunition before they could start on a determined campaign, which was so much desired by the troops. One of the German headquarters, however, was shelled effectively by the British on April 1, 1915, and on the following day mortars in the trenches did considerable damage in the Wood of Ploegsteert. A mine blew up a hundred yards of the trenches that were opposite Quinchy, a village to the south of Givenchy, on April 3, 1915. To offset this the Germans bombarded the British line at that point. They also shelled Fleurbaix, which is three miles southwest of Armentieres, on April 5, 1915. The British on the same day wrecked a new trench mortar south of there. On April 6, 1915, the German artillery began to be more active both north and south of the Lys, and the British retaliated by shelling the railway triangle that was near Quinchy. German soldiers were slain and others wounded when a mine was exploded at Le Touquet, on the north bank of the Lys. One of the kaiser's ammunition depots was blown up near Quinchy on April 9, 1915, and his men were driven from their trenches in front of Givenchy by mortar fire. The comparative quiet along the front was broken by the fight for the possession of Hill 60, which became famous because of the rival claims as to victory. The mound, for it was little more, getting its name on account of its height--sixty meters--was of importance only because it screened the German artillery which was shelling Ypres from the bridge to the west of Zandvoord. British trenches had been driven close to this hill by the Bedfords, whose sappers tunneled under the mound and there prepared three mines. At the same time the Germans were tunneling to plant mines under the Bedfords' trench. In this underground race the Bedfords won on the night of April 17, 1915, when they blew three big craters in the hill, killing almost to a man all of the 150 Germans who were on the little rise of ground. The Bedfords then dashed forward to the three craters they had opened up and took a quarter of a mile of the German trenches.