It does appear to be the case that some were fitted as an ad hoc arrangement by crews during the Battle of France:
http://www.century-of-flight.net/Avi...y%20Battle.htm
Quote:
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One forward firing 7.7 mm (0.303 in) Browning machine-gun in in the starboard wing with a 400 round magazine and combat ciné camera and one rearward firing 7.7 mm (0.303 in) Vickers 'K' machine-gun in the rear cockpit with 485 rounds. Early aircraft had a 7.7 mm (0.303 in) Lewis machine-gun until replaced by the Vickers 'K' machine-gun. During the Battle for France, crews often hastily added a ventral gun below the fuselage just aft of the wing. This gun was aimed by the third crew member using a mirror sight.
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Though I've never seen any pictures or details of the setup.
A