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Raid
A raid is a move that can only be performed by a commander with the 
Pillager ability if all of the units
under his command also have this ability. The force under his command can raid an adjacent province,
killing population, causing unrest, and gaining 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.
Raiders may be discovered by province defense or patrollers. A limited combat is initiated if the raiders
are caught. In this case it will be a battle between province defense + patrollers and raiders. Winning the battle will not
conquer the province and there will be no pillaging done that turn regardless of outcome.
You can read more on Raid here