ISBN: | 978-5-5106-4901-7 |
High Quality Content by WIKIPEDIA articles! Unternehmen Donnerkeil (Operation or Undertaking Thunderbolt) was the codename for a German military operation of the Second World War. Donnerkeil was designed as an air superiority operation to support the Kriegsmarine`s (German Navy) Operation Cerberus, also known as the "Channel Dash".