Soviet S- Class΄Stalinets΄ fleet submarine (officialy just named ΄medium΄).
After its defeat in WW I, the German Weimar Republic was forbidden under the terms of the Treaty of Versailles to have submarines or build them in its own yards .So, proxies like the Netherlands-based NV Ingenieurskantoor voor Scheepsbouw (IvS), a subsidiary of Deutsche Schiff- und Maschinenbau AG-AG Weser (Deschimag), was developing such a submarine for Spain during General Primo de Rivera's dictatorship. The Soviets watched the boats development and the prototype΄s trials in Spain closely, but as Spain lost interest (...) that prototype was sold to Turkey in 1935, serving until 1947 as the Gür.
The design was considered satisfactory and the Soviets bought it, with the condition Deschimag to make improvements and assist with the building of prototypes, which it did. Construction commenced in December 1934, first in Leningrad and then Nikolayev and Gorky, using partially German equipment. After the 3rd prototype (IX series), German made machinery was replaced with domestic equipment (IX bis series). 56 were completed when Barbarossa struck. In all, they sank 82,770 tons of merchant shipping and seven warships, which accounts for about one-third of all tonnage sunk by Soviet submarines during the war. One, the S-13, sank 5 ships and damaged one ship, including two large transports, "Wilhelm Gustloff" and " General Steuben ", within 10 days , with more than 12,000 people killed. Two were handed over to the PLN after the war.
The original design was also improved by the Germans themselves, to become the famous Type VII and Type IX U-boats of the
Kriegsmarine, hence the similarity.
@Fairline Including the Danes that resisted for about six hours and not the Czechoslovak armies in exile that fought throughout the war seems a little unfair.
These were the Czechoslovak Legion (Poland- 1939), the 1st Czechoslovak Infantry Division and 5th Fighter Squadron (France- 1939), the Czechoslovak 11th Infantry Battalion and the 310, 311, 312 and 313 Czechoslovak squadrons, later the
Czechoslovak Fighter Wing (Commonwealth- 1940) , the Czechoslovak Independent Armored Brigade (Commonwealth- 1943), the 1st Czechoslovak Brigade (Yugoslavia- 1943), the
1st Czechoslovak Mixed Air Division, the 1st Czechoslovak Army Corps and the 2nd Czechoslovak Parachute Brigade (USSR- 1943/44).