The theme of war features prominently, at least in volume, in narrative sources from the fourteenth century onwards.1 Many medieval conﬂicts were triggered without much thought or planning, but it would be wrong to think that advance planning was completely alien to medieval governments. For war to be fought well, it was necessary to effectively combine money, men and their equipment, as well as logistical support, on the battleﬁeld.2 Continual problems with manpower, command, money and supplies had to be dealt with. So few noblemen were willing to join military operations that, until the mid-ﬁfteenth century, war remained an individual venture: gains and losses concerned each combatant, and state intervention was uncertain or marginal. In addition, war was not just for professionals. Everyone had the right to defend himself against aggression, be he in a rural community, town or principality.