For more information about Barbarossa (this information is not striktly part of the game, it is just informative)

See:

• Wikipedia on Barbarossa
• Military history online
• History learning site (uk)
• The Jewish virtual library
• Operation Barbarossa

Megagame Makers London did organise “Clash of Titans”, the UK name for this game at least twice. See the list at Megagame Makers