Second-generation Fox II entered Belgian Air Force service early 1932. After lengthy and complex production history, some 90 licence built Foxes (Fox II, Fox III, Fox VI, Fox VII and Fox VIII) equipped 9 escadrilles of the Belgian Air Force at the time of the German invasion on 10 May 1940. Despite obsolescence it is reported that the type mounted nearly one hundred individual sorties during this short campaign. One German Bf 109 was also claimed as a probable destroyed during the conflict by Lieutenant Etienne Dufossez.
Switzerland used two Fox VI from 1935 to 1945, latterly as target tugs.

Total production: approx. 245
Fox I (28) - Original prototype and production model as 2-seat day bomber with one 450hp Curtiss D-12.
Fox IA (1) - Re-engined Fox I with one Rolls-Royce Kestral (conversion).
Fox II (1) - Prototype for 3-seat bomber version with one 480hp Rolls-Royce F.XIB (Kestrel IB).
Fox II (43) - Initial production model with Kestrel IIS and fixed ventral radiator. 12 Fairey built and 31 Belgian (Avions Fairey) license-built.
Fox III (1) - As Fox II but with one 340hp Armstrong Siddeley Serval. Subsequently fitted with one Kestrel IIMS as prototype for Fox IIIS.
Fox III (13) - Production model for 2-seat reconnaissance-fighter version. All were license-built in Belgium (Avions Fairey).
Fox IIIC (48) - Modified Fox II with enclosed cockpits and one Kestrel V (one was built as a Fox IIICS dual-control trainer). All were license-built in Belgium (Avions Fairey).
Fox IIIS (4) - Dual-control trainer version. All were license-built in Belgium (Avions Fairey).
Fox IV (6) - Floatplane. Peruvian order.
Fox V (1) - Prototype. Modified Fox II (conversion) with one 650hp Hispano-Suiza 12Ybrs.
Fox VI (approx. 85) - Production model for 2-seat reconnaissance-fighter version (included 4 as dual-control trainers and 2 for a Swiss order). All were license-built in Belgium (Avions Fairey).
Fox VII (2) - Single-seat fighter version of Fox VI with max six machine-guns. Both were license-built in Belgium (Avions Fairey).
Fox VIII (12) - Improved Fox VI. All were license-built in Belgium (Avions Fairey).

The Fox saw service in: Belgium and Switzerland (2).

Technical details
Type:_____________Reconnaissance-fighter
Crew:_____________2
Span:_____________11.58 m
Lenght:___________9.17 m
Engine:___________Hispano-Suiza 12 Ydrs / 860 hsp.
Max speed:________365 km/h at 4,000 m
Service ceiling:__11,200 m
Armament:_________One or two fixed forward-firing machineguns; one flexible machinegun in rear cockpit; provision for light bombs.

Sources:
Combat Aircraft of World War Two - Elke C. Weale, 1985