Percy questions the purpose of their practice, expressing confusion about the relevance of their training to real-life scenarios. He wonders if the group often engages in attacks on well-defended locations, implying that the drills may seem unnecessary or disconnected from their actual experiences.

This moment highlights Percy's characteristic pragmatism and curiosity, as he seeks to understand the rationale behind their activities. His observation suggests that the training might not be particularly applicable to their true adventures, provoking thought among his companions about the effectiveness and focus of their preparation.