The development of Course of Action(COA) is a key step of military planning. In most existing literature on COA development, the previous studies only take unilateral actions of friendly force into account. Considering the antagonism of war, we propose models that contain actions of both friendly and enemy force based on multi-stage games with incomplete information. Influence net is used to analyze the uncertain relationships between actions and battlefield situation. In the end, numerical examples are presented to illustrate the models and solution, showing that the COA developed in the current study is suitable for the antagonistic situation.