A major effect of the combined offensive on Sperrle's air fleet was the diversion and reinforcement of "Luftflotte Reich" at the expense of "Luftflotte" 3. By June 1944, the number of fighter aircraft available in the west numbered just 170. Sperrle's air fleet had, at most, 300 fighter aircraft on 6 June 1944 to contest the D-day landings. The Western Allies amassed 12,837, including 5,400 fighters. Sperrle's air fleet was particularly weak in night fighter units. Given the low priority for their production, Sperrle went for periods with no night–fighting capabilities despite the crucial geographical position of his air fleet and the exposure of important French industries to night attack. The diversion of resources extended to anti-aircraft artillery. On 14 May 1944, the OKL cancelled an order to divert five heavy and four light or medium batteries, each from "Luftflotte" 1 and 6, to Sperrle, and instead rerouted them to "Luftflotte Reich". Sperrle did retain the III Flak Corps which could be used in ground combat.