Fighting a foe in its flank or rear is a great advantage as tightly formed units cannot easily turn to face their foe. To represent this:

Flank Attack

If your unit is engaged with the enemy's flank arc, you may claim a bonus of +1 combat result point.

Rear Attack

If your unit is engaged with the enemy's rear arc, you may claim a bonus of +2 combat result points.

Note that these bonuses are cumulative.