During an assault, which of the following is a key action to achieve operational success?

Fixing the enemy is a crucial action during an assault because it involves engaging and immobilizing the enemy forces in their current position, thereby preventing them from maneuvering or conducting effective counterattacks. This action helps to establish a secure environment for the attacking force, allowing them to advance and maintain momentum. By fixing the enemy, the attacking unit can apply pressure and exploit vulnerabilities, ultimately leading to operational success.

In the context of an assault, creating a diversion may serve as a strategy to distract or confuse the enemy, but it does not directly apply pressure or limit the enemy’s capabilities in the same way. Defensive positioning is more appropriate for situations where the primary objective is to hold ground rather than to assault. Withdrawing troops would generally indicate a retreat rather than a proactive action necessary for achieving success in an assault.