What is one of the main actions taken during a hasty ambush once the enemy arrives?

In a hasty ambush, the primary goal is to take the enemy by surprise and maximize the effectiveness of the attack. When the enemy arrives, the immediate action is to initiate the attack to exploit the element of surprise. This is critical because a hasty ambush is specifically designed to engage the enemy swiftly before they have a chance to react or regroup.

Other options do not align with the primary objectives of a hasty ambush. For instance, retreating to a safe distance would negate the purpose of conducting an ambush, which involves engaging the enemy directly. Establishing communication may be necessary, but in the context of a hasty ambush, it cannot take precedence over launching the attack when the enemy is present. Similarly, reassessing the battlefield may be prudent in a longer-term engagement but is not a main action in the immediate execution of a hasty ambush. Thus, initiating the attack stands out as the most effective and expected course of action in this scenario.