Hello,
A few clarifications on this scenario:
1) Only French units UNDER STRENGTH (i.e., those that have lost blocks, including stragglers) can leave the board at the bottom of the right bank!
2) If these conditions are met, AS MANY units as you want can leave the board per turn if movement permits.
3) If they are on the left bank, French Leaders CANNOT flee the board (as the official rule allowed when they are alone and survive a test).
4) French Leaders killed on the left bank also give 2 POINTS to the Russian player.
5) Units crossing the bridge must STOP on it.
6) French units killed on the bridge only give 1 POINT to the Russian player.