On 9 July ULTRA intercepted messages from Sperrle notifying his units that "ruthless" fuel economy measures be made and forbade the non-essential expenditure of fuel. Another decrypted message from "Luftflotte" 3 to OKL stated that air attacks had depleted fuel stocks to such an extent that June's allocation would have to last to the end of July. II. "Jagdkorps" was ordered by Sperrle to cease ground-attack and night operations in August owing to the fuel crisis. In August 1944, as the German army retreated from France, Sperrle's air fleet could fly only 250 missions to cover it.