If "Stop the enemy advance" is an operational objective, during which phase would it most likely occur?

The operational objective of "Stop the enemy advance" aligns most closely with the Seize Initiative phase. This phase focuses on regaining control over the operational environment and halting the momentum of opposing forces. When an enemy is advancing, it is crucial to take immediate action to counter their progress, which is exactly what the Seize Initiative aims to achieve. This phase typically involves both defensive and offensive actions designed to interrupt or disrupt the enemy’s plans, effectively stopping their advance.

In contrast, the Counteroffensive Phase would primarily revolve around launching an offensive to reclaim territory after an enemy advance has been halted. Campaign Sustainment involves maintaining forces and resources over a longer period, focusing on logistics rather than immediate tactical objectives. Finally, Follow-On Operations generally occur after a successful engagement or campaign, focusing on securing objectives and consolidating gains rather than stopping an ongoing advance. Thus, Seize Initiative is the most appropriate context for the objective of stopping the enemy advance.