The heavy fog of the early morning on Thursday threw their assault troops at some points into wild confusion. The first line of assault, each division apparently advancing with two regiments in line, with two battalions in line, with the other strength of the divisions following in depth, with light machine-gun companies at intervals of 100 yards, and then heavy machine guns and field artillery, sometimes became hopelessly mixed up with the third and fourth lines, while right battalions were confused with left battalions. This fog and the British machine-gun fire, which caught the German waves, checked the pace of their onslaught and caused heavy losses. The German high command relied entirely on weight of guns and man power to break the British resistance, and the driving power of the whole monstrous machine was set in movement. The British line was not strong enough to hold all the old positions against such a tide of brute force. The men served their guns and rifles, but as attack followed attack and column followed column, and their own losses increased as the hours passed, they were ordered at certain points to give ground and fall back, fighting heroic rearguard actions from one position to another. BRITISH LINE BENDS The main attack, just south of St. Quentin, was directed against Urvillers and Essigny, and the enemy forced his way through these places by great drives. The British garrison there was partly destroyed by his stupendous gunfire. He gained possession of Essigny before midday, March 21, and captured Contescourt, on the edge of the canal. This gave him important high ground, of which he made full use. He succeeded by this movement in bending in the British line at the right flank of the Ulster division, north of the canal, which he crossed hereabout, and by advancing his field artillery was able to bombard the line to which the main body of the British troops had been withdrawn. Down from Maissemy and Holnon Wood to Savy and Roupy he pressed forward against this line. The enemy was so densely massed that there was a division on about a kilometer of front. None of them spread out on more than two kilometers for a division, with a battalion for every 500 yards. German storm troops were able to force their way to Vendeuil, Lyfontaine, and Benay, south of Essigny, and to strike against Jussy and Tergnier, on the St. Quentin Canal, on the evening of the first day. They brought up two more divisions, and that night, owing to the pressure of their attacks, it was decided that the British withdraw to a prepared line further west, which was the best defense. This was done during the darkness, the retirement being covered by gallant rearguards. This morning the Germans followed up our withdrawal by clearing up all the ground in the bend formed by the acute angle of the St. Quentin Canal, which has its apex at Ugny, six kilometers east of Ham, and it was reported that their patrols had entered the town of Ham itself.