From S&T 68

Stonewall S&T 67 Game Errata

[8.77] (addition) A unit may either be placed in reserve status
or may be taken out of reserve status during a Friendly Movement
Phase. The unit may not do both on the same Friendly Movement
Phase.

[11.0] (clarification) General Rule: Mounted cavalry units do
not have a Zone of Control.

[13.2] (omission) The second sentence should read: Furthermore,
it must be able to move into the defending unit's hex through 
one of the attacking unit's frontal hexsides.

[18.87] (addition) Artillery units defend in melee combat with
a strength of 1, regardless of the strength of the gun crew.