In 1935, the RLM (Reichsluftfahrtministerium, Reich Aviation Ministry) put out a tender for a new Luftwaffe aircraft (suitable for liaison, army co-operation today called Forward Air Control), and medical evacuation, as required to several companies. Penned by chief designer Reinhold Mews and technical director Erich Bachen, Fieseler's entry was the most advanced in terms of STOL performance, by far. A fixed slat ran along the entire leading edge of the long wings, while the trailing edge, inspired by earlier 1930s Junkers aircraft wing control surface designs, including the ailerons, was a hinged and slotted flap. The wings could be folded back along the fuselage, allowing it to be carried on a trailer or even towed slowly behind a vehicle. The long legs of the landing gear contained oil and spring shock absorbers that compressed about 450 mm (18 inches) on landing, allowing the plane to set down almost anywhere. In flight they hung down, giving the aircraft the appearance of a very long-legged, big-winged bird, Hence its nickname, Storch. With its very low landing speed the Storch often landed "at place" or even backwards, in case of wind from directly ahead.

The first Fi 156 V1 prototype flew in the spring of 1936. It was powered by a 180 kW (240 hp) inverted-vee Argus As 10C V8 engine, which gave the plane a top speed of only 175 km/h (109 mph), enabling the Storch to fly as slow as 50 km/h (32 mph), take off into a light wind in less than 45 m (150 ft), and land in 18 m (60 ft). It was followed up by the second V2 prototype and third V3 prototypes, the ski-equipped V4, plus one V5 and ten Fi 156A-0 pre-production aircraft. It was immediately ordered into production by the Luftwaffe with an order for 16 planes, and the first Fi 156A-1 production aircraft entered service in mid-1937.

Fieseler then offered the Fi 156B, which allowed for the retraction of the leading edge slats and had a number of minor aerodynamic cleanups, boosting the speed to 208 km/h (130 mph). The Luftwaffe didn't consider such a small difference to be important, and Fieseler instead moved on to the main production version, the C.
The Fi 156C was essentially a "flexible" version of the A model. A small run of C-0s were followed by the C-1 three-seater liaison version, and the C-2 two-seat observation type (which had a rear-mounted MG 15 machine gun for defense). Both models entered service in 1939. In 1941, both were replaced by the "universal cockpit" C-3, suited to any role. Last of the Cs was the C-5, a C-3 with a belly hardpoint a camera pod or drop tank. Some were fitted with skis, rather than wheels, for operation on snow.

Other versions of the Fi 156 were the C-3/Trop, which was a tropicalised version of the Fi 156C-5, and the Fi 156D which was an air ambulance version. The first two Fi 156D models were the D-0 pre-production aircraft, and the D-1 production aircraft, powered by a an Argus As 10P engine. Ten Fi 156E pre-production aircraft were fitted with tracked landing gear. The Fi 256 was a five-seat civil version, only two were built at the Morane-Saulnier factory at Puteaux in France.

The Storch could be found on every front throughout the war. It will probably always be most famous for its role in the rescue of deposed Italian dictator Benito Mussolini from a boulder-strewn mountain top near Monte Cassino, surrounded by Italian troops. German commando Otto Skorzeny dropped with 90 paratroopers onto the peak and quickly captured it, but the problem remained of how to get back off. A Focke Achgelis Fa 223 helicopter was sent, but it broke down en route. Instead, pilot Walter Gerlach flew in a Storch, landed in 30 m (100 ft), took aboard Mussolini and Skorzeny, and took off again in under 80 m (250 ft), even though the plane was overloaded. The involved Storch rescuing Mussolini bore the radio code letters, or Stammkennzeichen, of "SJ + LL" in motion picture coverage of the daring rescue.

General characteristics
Crew: 4
Length: 9.9 m (32 ft 6 in)
Wingspan: 14.3 m (46 ft 9 in)
Height: 3.1 m (10 ft 0 in)
Wing area: 26 m² (280 ft²)
Empty weight: 860 kg (1,900 lb)
Loaded weight: 1,260 kg (2,780 lb)
Powerplant: 1× Argus As 10 air-cooled inverted V8 engine, 180 kW (240 hp)

Performance
Maximum speed: 175 km/h (109 mph) at 300 m (1,000 ft)
Combat radius: 380 km (210 knots, 240 mi)
Service ceiling 5,200 m (17,060 ft)
Rate of climb: 4.8 m/s (945 ft/min)
Wing loading: 48.5 kg/m² (9.9 lb/ft²)
Power/mass: 143 W/kg (0.087 hp/lb)

Armament
Guns: MG 15 machine gun

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