As a first step towards the development of methodologies for doctrine modelling a study and knowledge representation of doctrines at operational, tactical and armour technical level has been performed. The aim has been to supply information fusion processes with á priori knowledge, which in this case is knowledge about the enemy´s tactical behaviour. There are many unpredictable factors that can play decisive role in warfare. An important observation made during the study is that uncertainty increases dramatically as soon as the first shot is fired. Therefore it will be difficult to make battle models which give a good prediction of the enemy´s course of action that is most likely. When modelling doctrines for information fusion processes, the first step should be to make models for tactical behaviour before and after the battle. This report describes how doctrines can be represented in terms of classes and their interrelationships using Unified Modelling Language (UML). Additionally we describe in an example how the doctrine models and information fusion process are coped with.