The Junkers Ju 87 or Stuka (from Sturzkampfflugzeug, "dive bomber") was a two-seat (pilot and rear gunner) German ground-attack aircraft of World War II. Designed by Hermann Pohlmann, the Stuka first flew in 1935 and made its combat debut in 1936 as part of the Luftwaffe's Condor Legion during the Spanish Civil War. The aircraft was easily recognizable by its inverted gull wings, fixed spatted undercarriage and its infamous Jericho-Trompete ("Jericho Trumpet") wailing siren, becoming the propaganda symbol of German air power and the Blitzkrieg victories of 1939-1942. The Stuka's design included several innovative features, including automatic pull-up dive brakes under both wings to ensure that the plane recovered from its attack dive even if the pilot blacked out from the high acceleration.