Britannica Sources used in this answer

Why can secrecy make a surprise attack difficult to carry out?

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tactics Sumerian phalanx, a block of foot soldiers depicted standing shield-to-shield, presenting spears, and advancing in a dense mass, detail from the Stele of the Vultures, limestone bas-relief, c. 2450 bce; in the Louvre Museum, Paris.

In the context of military tactics, secrecy is a fundamental prerequisite for achieving surprise against an enemy. However, maintaining this secrecy often conflicts with the need for rapid action, which is frequently essential to successfully executing a surprise attack.1

The difficulty lies in the tactical paradox of balancing these two requirements. To achieve surprise, a commander must keep operational details hidden from the enemy; yet, the rapid movement and coordination of forces required to strike quickly can make it challenging to maintain that necessary level of secrecy. Overcoming this tension requires a commander to strike a careful balance, adapting their approach to the specific enemy, terrain, and objectives at hand.1

Ultimately, because a commander is confronting a living, reactive enemy, the ability to maintain secrecy while simultaneously managing the speed and flexibility of their forces is a complex challenge that defines the difficulty of executing surprise attacks.1