I'm asking it since I often wonder which one one of the 2 is better:
- Expend my unit action capability by leaving a detachment and withdrawing on my new defensive line, hoping the enemy will be really slowed down and unable to reach me next turn
- Withdraw on my new defensive line, and use my action capability to entrench instead and face the incoming enemy in the best possible conditions
You've got only one action to make with your units in a turn so knowing what kind of movement penalty represents a detachment would help deciding in which case I better keep my action capability for entrenching instead [:)]