From cwb.pdf:
From the parameter file"Breastworks Values
Movement: the additional movement cost to cross Breastworks.
Combat: the combat modifier applied to fire and melee against units behind
Breastworks.
Building: the per-turn probability used to determine when Breastworks are
constructed.
1. Though the manual refers to the per-turn probability of breastwork completion, does the number of units on a hex also have an effect?Breastworks Values
Movement: 2 Combat: -50% Building: 50%
The reason for this question is that if the hex is under attack some units are needed to defend the hex, yet you still want to have the breastworks under construction. Should the number of units is irrelevant, then only one unit would need to be assigned to breastwork construction.
2. The reference to "Combat: -50%" means that the attacking units effective firepower on the defending unit is reduced by 50%. Obvious, but just wanted to confirm.