DESPERATE BREAKOUT

In your Movement phase Select one unit from
your army to make a fall back move. When doing
so it's models can move across enemy models.
Roll one D6 for each model in that unit; for
each result of 1, one model in that unit is
destroyed. Any model in that unit that ends
it's Fall Back move within Engagement Range is
is destroyed. If the unit is not destroyed, it
cannot do anything else this turn, even if it
has a rule that would allow it to do so after.