Which formation type is noted for its best control but lack of security on the flanks and rear?

The squad line formation is recognized for providing excellent control during movement and engagement, particularly because it allows soldiers to face an enemy directly and engage effectively. This formation is characterized by a broad front, which maximizes the unit's ability to deliver firepower and maintain a cohesive front against threats. However, one of its significant drawbacks is the vulnerability of the unit's flanks and rear. In a squad line, the ability to secure these areas is limited because the soldiers are primarily focused on the front, leaving gaps that could be exploited by the enemy. This lack of security can lead to potential risks if the unit is flanked or attacked from behind, emphasizing the importance of situational awareness and the need for additional measures to protect these vulnerable areas when using the squad line formation.