Sally (noun)

1. A sudden and often unexpected rush out of a defensive position to attack the enemy.
2. A sudden and usually brief excursion out of a usual place or routine.

Origin:

From old french saillie, from salir ("to leap, bound"), from latin salire ("to leap, jump").

Examples:

1. The soldiers made a sally out of the castle to attack the enemy.
2. The enemy was taken by surprise when the soldiers made a sally out of the castle.
3. He made a sally out of the door to catch the thief.
4. The sally was quick and successful, the enemy was caught off guard.
5. The sally was a temporary excursion from the regular routine, but it was worth it.