What tactical mission task involves restricting enemy movement to a narrow zone while using terrain and obstacles?

The tactical mission task that involves restricting enemy movement to a narrow zone while utilizing terrain and obstacles is referred to as 'canalize.' This approach strategically leverages the natural landscape and artificial barriers to funnel enemy forces into a constrained area. By doing so, friendly forces can significantly enhance the effectiveness of their defensive actions, as they can concentrate firepower and resources on a limited area, thereby increasing the likelihood of successful engagement and eliminating the enemy's ability to maneuver freely.

In contrast, other tactical terms such as 'contain' focus more on preventing an enemy's advance without necessarily constraining their movement to a defined channel. 'Suppress' refers to actions taken to reduce the effectiveness of an enemy's capabilities through firepower but does not inherently involve controlling areas of terrain or obstacles. 'Contend' is less commonly used in tactical terminology and does not accurately represent the specific action of conditionally limiting enemy movement.