France '40: Early Releases?

[Sir John Cope]

In a current game (0510-01B4),  playing the German side, the time is 0800 May 20th. In the vicinity of Brussels, I'm in contact with eight bns of 51st Highland Div, while south of the Sambre between Phillipville and Beaumont I have contact with at least one armoured unit of French 2nd Armoured (2e division cuirassee).  

The trouble is that 51 Highland doesn't release until 0400 May 21, while 2nd Armoured is scheduled to release on May 27. Release by spotting is very unlikely: I never pushed toward the 51st's starting area on the Maginot Line, and even if my troops came close enough to spot a few Highland bns, that wouldn't explain the appearance of the entire division before Brussels. And certainly my troops have never been anywhere near the starting position of 2nd Armoured, far behind the front at Chalons-sur-Marne. 

So my question is how is it possible for units to be released early, such that these two divisions are before my troops several days' travel from their starting areas? Not complaining, mind - but certainly puzzled.