In specific domain such as wargame, simulator developers may not well understand domain knowledge, which domain experts know. In such a case, the developers may leave detail domain knowledge within simulation models as a black box which is filled by domain experts. Thus, a simulator can be synthesized by filling the black box with algorithms for domain specific objects. This paper proposes a methodology for automatic synthesis of wargame simulators which are developed by the "DEVS (discrete event systems specification)" framework. For the synthesis the co-modeling methodology is employed in the specification and implementation of discrete event models.