[Mobhack]

If you set up a random UK/GER battle in between the historical dates of Dunkirk and the meeting of the Afrika corps, the game clock gets automatically advanced to the desert. Because that is historically what happened as Don says.

If it did not do this then we would be getting complaints from players who got some random "Europe" battle locations in the gap time, if they selected some date in between Dunkirk and El Aghelia/western desert in 2/41.