This should be fixed in 3.2.6 you can now win by destroying all enemy units. You can also turn on Show Hidden Victory Hexes in Settings for an early victory (but probably not what scenario designed intended)
Apologies for the thread resurrection. I can't seem to find a way to get a Brückenpioniere unit into a river hex, and I'm coming up blank with extensive Googling. Playing the download for Mac OS X, French 7th Army Moves North scenario. Thanks for your help.
