What is the tactical mission task in which another maneuver force moves to a position where it can engage the enemy by direct fire in support of another maneuvering force is?

The tactical mission task you are describing is known as "support by fire." In this task, one maneuver force positions itself to deliver direct fire against the enemy, providing covering fire and suppressing enemy positions to enable another maneuvering force to close with or maneuver against the enemy effectively. This coordinated action enhances the overall effectiveness of the operation while minimizing risk to the maneuvering unit.