Fortresses have a defense Strength factor of 1-3 steps. More than 1 unit may attack a target. A unit may not attack more than once per turn. Combat factors remain as original. Units with 0 Strength factor may still receive replacements, but may be attacked and destroyed.
Supply is handled by the computer.
Units OOS lose a step starting with 2nd consec. Russian cavalry OOS is destroyed. Replacements rebuild lost steps.