To address the need for precise and objective quantitative analysis tools in military operations, this study explores the innovative application of the concept of entropy from information theory in tactical situation analysis. This is achieved by constructing Situation Entropy, Situation Asymmetry Index (SAI), and Situation Stability Index (SSI) to quantitatively assess the dynamic characteristics of force distribution on the battlefield. Experiments were conducted using the open data from the Institute of Automation, Chinese Academy of Sciences' tactical wargaming. The research findings indicate that Situation Entropy effectively measures the spatial distribution of troops, SAI can identify the balance and asymmetry in force allocation, and SSI evaluates the stability of the battlefield situation. These indices demonstrated their practicality and reliability in wargame simulations, aiding military personnel in better understanding battle dynamics, optimizing tactical decisions, and providing solid support for developing effective strategies in complex adversarial environments. This study introduces new tools for military situation analysis and paves the way for computer-aided tactical decision-making.