Abstract: This paper illustrates a methodology for developing aggregated combat models using high-resolution simulation and the Markovian Lanchester process. The details of mathematical models involved in a high-resolution simulation process of a "Meeting Engagement" tactical scenario are presented, along with theoretical discussion on the Markovian Lanchester model. The output from the discrete event simulation model is used to estimate the attrition rates for an aggregated Lanchester model. A comparative study of various statistical estimation methods suitable for such estimation is also presented.