In the midst of a driving rain British troops in Flanders launched an attack in the afternoon of August 27, 1917, along the St. Julien-Poelcappelle road. They had set out to seize some of the concrete fortifications, each of which held a score or so of Germans with machine guns and heaps of ammunition, who could sweep a wide field with fire and had caused the British many losses in men. The Steenbeke and Hannebeke Rivers had overflowed and transformed the region round into bogs. Into this marshland the men from Yorkshire and other English counties, drenched to the skin from being out all night, struggled forward to destroy the Germans' "pill boxes." There was violent fighting near the Springfield and Vancouver Farms northeast of St. Julien, which were strongly held by the Germans. The machine-gun fire was especially heavy at these places, but the British pushed forward and the Württembergers who had been sent up from Roulers to strengthen the German advance posts, were driven back. The British succeeded in capturing two of the concrete forts, making prisoners of the defenders. On the Aisne front northwest of Hurtebise the Germans during the night of September 1, 1917, tried by desperate assaults to recover lost positions, but were driven off by gunfire. North of Hill 304, on the same date there was intermittent artillery activity, and on the heights above the river the French foiled two attempted surprise attacks. Near Lens and La Bassée the Germans endeavored to raid British trenches, but were repulsed. Southwest of Havrincourt they achieved a temporary success, bombing their way into British advanced posts and forcing the defenders to fall back. But the British quickly rallied, and by a dashing counterattack forced out the invaders and reoccupied the posts, taking prisoners and leaving a considerable number of dead Germans on the field. The reappearance of the sun and fair weather after days of rain made it possible to resume military operations. The Germans were the first to attack during the night of September 2, 1917, a British position southwest of Havrincourt. The assault was preceded by a heavy bombardment in which gas shells were freely used, but the British artillery and machine-gun fire was so intense that the attackers were driven back in disorder. Southeast of Monchy on the same date the British carried out a successful raid on the German trenches that proved a complete surprise to the enemy. British troops were atop of the Germans before they could make a strong defense, but finding they were inferior in numbers the raiders, after destroying many of the enemy, withdrew with their prisoners.