Destroyed units after peace for lack of transport?

[jackdoom]

Riddle me this...

As France I fired both, the peace of Tilsit and of Schönbrunn, at the same time
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Both Austria and Prussia accepted, Russia was not involved in the war

Almost all my units in Prussia, those around Konisberg, and almost all my units in Austria, Ofen (?) and Ragusa, not those around Vienna, are destroyed instead of moved to the border

the message read...xxx unit was destroyed for lack of transport (or something to the effect)
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So, now I`ve managed to achieve peace and destroy most of my armies in one stroke...also Hamburg didn't changed hands and I think it was part of the deal, maybe I´m wrong about that one

Obviously this can´t be the intended behavior, so, what´s going on? How can I prevent it and go on playing? Is it fixable somehow? What the hell is "transport" in this game?
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Thanks