The unsuccessful debut of the first production version of the He 111A was not a disappointment for Ernst Heinkel even though the aircraft was fitted with BMW VI engine, which caused the aircraft to be under powered. The Last of the five pre-production prototypes, He 111V5, was equipped with the new DB 600 engine. The aircraft competed its first take-off in May of 1936. With a full military load it reached a maximum cruising speed of 340 km/h (211 mph), and these results were considered very successful at the time. The RLM immediately ordered the first production batch; the first production samples being delivered to KG 154 "Boelcke". At the same time, in August of 1936, the Spanish Civil War began. The Republican Government received military help from the Soviet Union, Germany, and Italy, together they gave support to general Franko and his rebels. The Aviation part of this support consisted of a special group named the "Legion Condor". At first, the "Legion Condor" received only Ju 52 transport planes; because Germany declared that its support would be non-military in nature. But during this time the republicans had obtained new soviet-built bombers, which they called "Katyushka" (well known as the Tupolev SB), and Hermann Goring insisted on testing one of the new German bombers in real war conditions. The Spanish Civil War was an excellent occasion for trials concerning the new-generation of planes; the He 111B,Do 17E, and Ju 86D.