While their allies were gaining ground and hastening the German retreat on their front, the French in the regions of Braye, north of Craonne, northwest of Rheims, and on the left bank of the Meuse, near Cumieres, were being hammered continuously by German guns. It seemed that defenses and defenders must be destroyed by this hurricane of fire and shell. But the soldiers of the Republic had learned many lessons concerning German methods of warfare since the fighting began in this region and knew how to conserve their strength, and were prepared to out-fight the enemy whenever the odds were anything like equal. The concentrated fire of the German guns damaged the French defenses, but were ineffective in crushing French spirit, so that the attacks that followed the bombardments failed in every instance to gain any advantage. Positions the British had captured earlier in the week south of the Ypres-Commines Canal were attacked by the Germans on June 15, 1917, following heavy artillery preparations. In the first dash a few Germans succeeded in approaching the British front trenches, but they were killed or driven out and the attack collapsed at all points. In the night of the 15th the sorely tried French forces continued to bear the brunt of German fury around Craonne and Mont Carnillet. Raids they made in the region of Hill 304, on the heights of the Meuse, broke down with heavy losses. East of Rheims the French were successful in minor operations in which they captured a good number of prisoners. Artillery duels were almost continuous on the following day north and south of the Ailette River, in the Champagne, and in the region of the heights of Carnillet and Blond. The Germans won a section of trench in neighborhood of Courcy, but later were driven out or destroyed by the French in a counterattack. East of Monchy-le-Preux the Germans after a heavy bombardment of British positions made an attack in force that was entirely successful in gaining the first-line defenses. The British were driven back with considerable losses to their main new position on Infantry Hill. After the disastrous experience of the German airmen during the battle of Messines Ridge their flying forces adopted the familiar tactics of mass formation. The British air pilots seldom encountered in these June days squadrons of less than fifteen machines, and occasionally they met aerial armies of as many as sixty planes. In some battles in the second week of June, 1917, between seventy and eighty machines were involved. Most of these air fights took place inside German territory, and despite superior numbers the British Royal Flying Corps continued to prove their superiority in the air over the Teutons. In one of these aerial battles, when a large number of planes were engaged, the British pilots smashed ten German machines, while only two British flyers were compelled to withdraw from the fight, one of them making a successful landing within his own lines.