Which element is essential for making informed battlefield decisions?

Gathering intelligence is essential for making informed battlefield decisions because it provides commanders with vital information about enemy movements, strengths, weaknesses, and intentions. This information helps in understanding the operational environment, allowing for strategic planning and tactical execution. Informed decisions are based on accurate and timely data, which can significantly influence the outcome of military engagements.

Heavy artillery support, while important for providing firepower, is not a decision-making element; it is a capability that may depend on the information gathered. The size of the unit and local terrain knowledge, though relevant to certain operational considerations, are secondary to the overall understanding of the battlefield provided by intelligence. Without accurate intelligence, decisions may be based on assumptions that can lead to costly mistakes. Thus, gathering intelligence is fundamental for effective command on the battlefield.