In the Austerlitz scenario Mack's forces are locked to the Ulm region. However, they also do not seem to be able to enter the fort at Ulm. In addition, when they are attacked on the first turn, they are still locked on the second turn.
Is this behavior correct? It seems like you should be able to have them retreat into the fortress like they did historically. Also, once attacked they should be able to flee.
Warren