1) Pinning forces squads to "Go To Ground"
2) "Go To Ground" reads that units take Morale checks as normal.
3) Losing 25% of a squad forces a Morale check
4) C:SM "Combat Tactics" allows a unit to choose to fail a Morale Check and Fall Back
5) C:SM "And They Shall Know No Fear" allows a unit that is Falling Back to automatically regroup (if further than 6 inches from an enemy)
EXAMPLE:
Enemy shooting
SM unit loses 1 man to a Sniper Weapon, fails it's Leadership check and is Pinned.
The SM unit goes to ground.
The SM unit loses two more models to fire.
At the end of the enemy shooting phase, the SM unit must make a Morale check for losing 25% of it's models.
The SM unit chooses to fail the test.
The SM unit Falls Back 2d6
Start of SM Movement Phase
The SM unit is is further than 6" from an enemy units.
ATSKNF allows the SM unit to auto-regroup and proceed as normal