Sometimes, particularly during the push and pull of combat, units make accidental contact with enemy units. Should this prove unavoidable, there are several ways to resolve this.
If a unit is contacted in its front arc, and if it is not itself already engaged in combat, the unit may either:
Commit to combat, aligning against the enemy unit that made accidental contact with it (neither unit counts as having charged and both fight in Initiative order).
Give Ground to avoid being drawn into an unwanted combat.
However, if a unit is accidentally contacted in its flank or rear arc, or is itself already engaged in combat, its owning player must move it (and, if necessary, any units it is in combat with) aside by the minimum amount necessary to ensure it is both 1" away from the unit that accidentally contacted it and still engaged in its own combat.