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Raid
A raid is a move a commander may perform only if they have the 
Pillager ability. If all units
under his command also have this ability, they can join the raid. A raiding party targets any adjacent province, where it
kills population, causes unrest, and gains gold. It is essentially the same as the Pillage order, except it is performed from an adjacent province. The raiding force returns to its starting province after the raid is complete.
Raiders may be discovered by province defense or patrollers. A limited combat is initiated if the raiders
are caught. In this case, a battle will commence with province defense + patrollers versus the raiders. Winning the battle will not
conquer the province. Additionally, a battle prevents any pillaging that turn, regardless of outcome.
You can read more on Raid here