the increasingly hot summer weather degraded aircraft readiness. Jasta 15 had been fitted with new Fokker D.VIIs. However, Jasta 12's lack of replacement Fokker Triplanes took them out of action for a while, and Jasta 13 was crippled. When replacement aircraft did show up for Jasta 12, they were 10 old used Triplanes instead of new Fokker D.VIIs. With fuel and oil in short supply, JG II seldom flew as an entire wing. Customarily, one jasta flew, one sat ready, and the others rested. Finally, in early June, Jasta 13 was half-equipped with new Fokker D.VIIs. However, by mid-June, Jasta 19 still was not fully equipped with Fokker D.VIIs, and Jasta 12 still flew a complement of Triplanes. There were even some Albatros D.Vs still in service with the wing. On 12 June 1918, the JG II Triplanes were grounded. Each jasta was now restricted to a monthly ration of 14,000 liters of fuel and 4,000 liters of oil. The scarce fuel and lubricants usually went to the newer and more effective Fokker D.VIIs. On 19 June, Jagdstaffeln 12 and 19 were again grounded for lack of airplanes. However, new Fokker D.VIIs began to arrive. Jasta 13 and half of Jasta 19 were issued the new planes. Any Triplanes they had were passed along to Jasta 12, but to no avail. They were forced to surrender all Triplanes as unserviceable on 24 June. On 28 June, 20 Fokker D.VIIs arrived and were split between Jagdstaffeln 12, 15, and 19. By now, Berthold was the leading surviving German ace, with 37 victories. Flying in agony as his wounded arm deteriorated, using only one hand, he was still an effective air fighter, but he welcomed rainy day groundings as a chance to recoup. Meanwhile, Jagdstaffeln 13 and 15 were involved in massive dogfights over Chemin des Dames almost every evening in late June. JG II now faced an invisible foe—influenza. On 6 July, all but three pilots of Jasta 19 were too ill to fly. However, Jasta 13 was still operational. In the runup to yet another offensive, JG II moved forward to a new base at Leffincourt. On 14 July 1918, JG II received 20 new Fokker D.VIIs; once these were parceled out, the wing was finally equipped with a single type of fighter. The last German offensive As German troops moved into their assault on 15 July 1918, JG II