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.