What is a common goal of both the Fix and Block obstacle effects?

The common goal of both the Fix and Block obstacle effects is to control specific engagement areas. These effects are utilized in military operations to impose constraints on enemy movement, thereby creating zones where the enemy is less able to maneuver effectively.

Fix obstacles are designed to hold an enemy in place, disrupting their plans and making them vulnerable to friendly forces. Meanwhile, Block obstacles are intended to impede or prevent the passage of enemy forces through certain routes, effectively managing the battlefield and dictating where engagements occur. By controlling these areas, friendly forces can enhance their tactical advantages, enabling better coordination and maximization of their combat power against the enemy.

This strategic purpose is critical for shaping the dynamics of a conflict, ensuring that military movements align with overall operational objectives. The other options don't align with the primary intent of these obstacle effects, which is focused on control and influence rather than promoting offense, enhancing mobility, or encouraging retreats.