You successfully intercept a unit in an adjacent area. The intercepting unit or force moves to the intercepted area and does battle. What happens to the units that conducted the intercept after battle? Do they remain in the area where the interception took place or do they return to the area they left?
It depends on which side wins the battle. If the intercepting units (defender) wins the battle, then they stay in the space they intercepted into and the attacker must retreat to the space from which they came. If the intercepted force (attacker) wins the battle, then the attacker stays in the space they were intercepted in, and the defender must retreat to an adjacent space[s] (assuming no fort or fortress).