After browsing through the countless mails under four different subjects (at
least there is no File Uploaded topic :P), it's time for the Loremaster to
speak.
The rules are clear.
The closest depot from Danzig is in Koenigsberg and the shortest way to reach
it is through the East Prussian area occupied by a Prussian corps east of
Danzig. Since it is occupied, it then moves into Koenigsberg which is also
occupied by enemy corps.
Now (repeating the same process) the closest depot to Koenigsberg is in Riga
and the shortest way there is through the area directly North of Koenigsberg.
Since that area is also occupied by the enemy (Prussian controlled French
corps) the Russian corps retreats one more area to the North. That is the one
directly below (South-West to be precise) Riga. There it's journey ends...
That's my 2c. For reasons I have mentioned multiple times in the past, I am not
a big fan of house rules and realism is not as straitfoward as it may seem.
Where my opinion leads us and who shares the frame of mind I know not but at
least I've answered the call of duty :P