Possible minor bug in PBEM Campaign

[Cross]

Just about to move off in my first turn - of the third battle - in a PBEM campaign, when I noticed that I could see an enemy halftrack.

The halftrack was in a place where I shouldn't be able to spot it, and no aircraft have yet been used.

I set up this battle, but in a PBEM camp I'm not certain if my first turn is 1a or 1b.

I've included a saved game. It's slot 005 and my password is (John if you're reading this, avert your eyes ) 'blunder'.