In September 1939, the Henschel Hs 126 was the main tactical reconnaissance aircraft of the Luftwaffe but the Polish campaign did not see its operational debut. In late 1938, the Legión Cóndor had decided to replace its ageing Heinkel He 45s and He 46s with this new type, which was used in combat in the final stages of the Spanish civil war and two were lost in operations. The last Henschel was struck off charge in the Spanish inventory in 1953, sixteen years after the maiden flight of an Hs 126. This book includes numerous unpublished photos, the first correct line drawings of the Hs 126 A-1 version and colour profiles by Erik Pilawskii, plus artwork by Txetxu Rubio.