Military Imports To Yugoslavia
In the 1920’s Yugoslavia fielded an air force of almost exclusively French aircraft, with local plants set up to effect repairs and construct aircraft. By 1931 a review by the British military attaché noted weaknesses within the air force, and so several aircraft were evaluated for their potential for Yugoslavia service. As well as fighters, Yugoslavia considered updating their bomber force to include heavy bombers. The decision was made to acquire a small number of three-engined bombers for comparison before purchasing a new bomber force. As a result 6 bombers of 3 different types were ordered: Dornier Do Y’s, Junkers G.24’s Czechoslovak Avia Fokker F.39’s, all of which were delivered in 1932. In 1937 the 2 improved Dornier Do Y’s, now renamed as Dornier Do 15’s, were also taken into Yugoslav service, joining the earlier heavy bomber candidates in the 261st Air Group. By 1939 the aircraft were considered obsolete and were relegated to transport duties.
The decision on a new fighter was a slower process, and only in September 1935 was an order placed for Hawker Fury’s with licences for local construction of additional aircraft and their Rolls Royce engines, although the delivery of the aircraft from Britain was not expected before mid-1937.
Meanwhile aviation technology was progressing rapidly, and the aircraft selected as frontline combat aircraft in the early 1930’s were rapidly rendered obsolete before they were even entered service. The Yugoslav acquisition process was so ponderous though, that the Fury’s remained in service as frontline combat aircraft into 1941.
Yugoslavia then entered a second round of aircraft selection, and in 1936 evaluated the Dornier Do 17. By 1937, with the increase in world tensions, Yugoslavia finally changed their procurement processes and started placing large orders for new aircraft.
In January 1937 Italy offered Yugoslavia a suite of combat aircraft types, but due to mistrust of Italian motives the offer was not seriously considered. But by March a Friendship Agreement had been signed with Italy and several types were demonstrated during the year, leading only to a sale of Caproni Ca.310 light transports. With the later sale of twin-engined Savoia-Marchetti SM.79’s to Romania, an order was placed for SM.79K’s for Yugoslavia.
In 1938 an order for the Dorniers and 100 Messerschmidt Bf 109’s was placed. Although Yugoslavia pre-paid for the orders, German politics intervened and, like similar purchases from other Balkan states, delays and misdirection dogged the orders. The Dorniers were finally shipped by April 1939, the Messerschmitt order remained in limbo.
Turning back to Britain, in 1938 Yugoslavia ordered 12 Hawker Hurricanes , and with the delivery of the first aircraft on 15th December 1938 Yugoslavia became the first export customer for the Hurricane. A second order for another 12 quickly followed, with a licence for local production. Both the Rogožarski and Zmaj factories near Belgrade were tasked with building another 100 Hurricanes, although neither plant proved to be up to the task of building at the rates hoped for. One flaw in the plan for the Hurricane was that the Merlin engines were all to be imported from Britain, which would lead to delays in future production.
Bristol Blenheim Mk.I’s were also ordered, with Yugoslavia being their second export customer, and produced locally, with the first 2 arriving in 1938 and the first from the Ikarus factory near Belgrade flying in March 1939.
In June 1939 Prince Paul made a state visit to Germany, and after meeting with Hitler the order for Bf 109’s was finally cleared, and delivery for the aircraft commenced in December 1939, although spares and support were not provided. In October 1939 Yugoslavia attempted another large order for German aircraft; a further 100 Bf 109’s, 30 Bf 110’s, 50 Hs 126’s and 31 Ju 87’s. But, again Germany procrastinated and prevaricated and these orders were never realised.
While Yugoslavia had developed a strong air force, the armoured vehicle branch had been significantly lower resourced. France had been the almost exclusive manufacturer of Yugoslav armour, with the initial tank purchase being outdated Renault FT’s and more advanced M28’s in 1929. Another batch of FT’s were bought from Poland in 1932, and in 1936 another 20 FT’s, in poor condition and now virtually obsolete, were received as military aid from France.
The Renault R35 was Yugoslavia’s first modern tank, and 54 were received from France in April 1940, effectively doubling the number of Yugoslav armoured vehicles. In early May 1940 Yugoslavia now formed 2 armoured units, the 1st Battalion equipped with the FT’s and M28’s were dispersed to Sarajevo, Skopje and Zagreb, while the 2nd Battalion with the R35’s remained in Belgrade.