On 31 March 1942 a German barrage balloon worked "as designed", bringing down an Allied aircraft.... except it was a captured one flown by a German pilot.
The aircraft was a former Russian captured I-16 ("Werknumber" 2335 in German loss report, from what I have seen from captured French aircraft could be a part of the Soviet serial number, or the entire one) flown by Ofw Gustav Küll of Ld.Kdo. 2/6, who was killed when he crashed south of Dünnwald, near Köln, after hitting a ballon cable. The aircraft was a total loss (100% damage).
Source: Matti Salonen, on this forum (
http://forum.12oclockhigh.net/showth...234#post240234)
(By the way I know examples of German bombers destroyed by balloons over UK, even if British balloons destroyed far more Allied aircraft than enemy ones, but I don't remember any case of Allied aircraft destroyed by German balloons).