In this thesis, I present an approach to a case-based reasoning system with explanation capabilities in the Warhammer Fantasy Battle domain. This product is meant to support Warhammer gamers in their initial army lineup, by providing suggestions based on previously successful games against an opposing horde. Explanations will be used in order to convey the reasoning behind the solution, to present the data the solution is based upon and why certain changes were made.The created product is capable of creating the army lineup and give partially satisfactory explanations, based on the goals set both for the application as a whole and explanations. Although a full domain model is not implemented, are the results promising; with the inclusion of more domain knowledge and cases, will a fully competent and accurate system be achievable.