The Germans had not achieved a degree of success commensurate with their exertions. Nevertheless, in the belief they were having considerable effect on Fighter Command, they prepared to launch their all-out assault on the RAF the following day. By 12 August, German air strength had reached acceptable levels. After bringing its serviceable rates up, the "Luftwaffe" began "Adlertag" with 71 percent of its bomber force, 85 percent of its Bf 109 units, and 83 percent of its Bf 110 units operational.