Historical reenactment is becoming a top-tier teaching tool in the countries of Southern Europe. In Spain specifically, this discipline is experiencing a boom as a heritage education method, particularly in informal settings. This article is the outcome of a qualitative research study of the results obtained from one hundred and fifteen educators from historical reenactment groups. The study analyses the methods used by the exponents of this discipline to teach war in the Middle Ages, specifically in three Spanish castles dating from the 11th to the 12th centuries. It has made it possible to analyse how the educational discourses are organised in relation to Medieval war within military spaces from this period, and how historical reenactment is a coadjutant in the construction of teaching/learning spaces from a heritage education perspective.