Summary of Military Organization and Warfare: Late Roman to Medieval Europe

## Introduction Medieval fortifications and siegecraft shaped warfare, politics, and urban life across Europe from the early Middle Ages through the late medieval period. This material focuses on how fortifications evolved, the armies that besieged them, and the techniques and engines used to reduce strongpoints. We will break down the concepts into manageable parts, examine examples, and relate developments to broader social and technological change. > **Definition:** A fortification is a constructed or natural defensive work designed to resist or deter military attack; siegecraft is the set of techniques and tools used to attack, starve, breach, or undermine such defenses. ## 1. Military Capacity and Urban Forces ### Growth of armies, population, and wealth - After the First Crusade, many Western states increased their military capacity, reflecting population growth, greater wealth, and political centralization. - Examples: - Late 12th-century England: monarchs could raise about 20,000 mounted troops for major campaigns. - Battle of Bouvines (1214): combined forces possibly reached ~40,000 men. - Late 13th century, Edward I: commonly mustered ~25,000 infantry and ~5,000 horsemen for campaigns in Wales and Scotland. - Philip IV of France drew large numbers from southern provinces; some regional levies may have numbered in the tens of thousands. > **Definition:** A levy is a force raised from the population (townsmen, peasants, vassals) for military service, often temporarily. ### City-state military resources - Italian cities in the 13th century could summon very large armed forces for offensive and defensive operations. - Examples (estimates): - Milan (propagandistic claims): 10,000 cavalry and 40,000 infantry from the city proper, plus 30,000 from dependent communities. - Florence: about 2,000 horsemen and 15,000 infantry from a population of roughly 400,000. Fun fact: The capacity of a medieval city to field troops was often as much about civic organization and wealth as raw population numbers; mercenary contracts and allied communes could swell forces quickly. ## 2. Evolution of Castle Architecture Castles remained central to warfare until effective artillery forced new designs. Their evolution can be described in stages. ### Early stages: earth and timber to stone keeps - Before Charlemagne, there was little systematic improvement on Roman fortifications. - Early burghs: simple earth-and-timber enclosures with a rectangular palisade, moat, a timber tower/keep, and basic garrison buildings. - 11th century: stone keeps began to replace timber; secondary baileys (enclosed courtyards) were introduced. > **Definition:** A bailey is an enclosed courtyard within a castle, typically surrounded by a defensive wall and often containing service buildings. ### 12th-century developments: curtain walls and gatehouses - The 12th century saw a building boom as wealth increased. Keeps were integrated within curtain walls of stone. - Common features: gatehouses, towers at corners, and barbicans (outer defensive works) before main gates. ### Late medieval: concentric fortresses - Inspired partly by Crusader experience, the greatest advancement was the concentric fortress: multiple layers of walls, each able to be defended independently. - Concentric designs emphasized depth of defense, overlapping fields of fire, and internal circulation for supplies and counter-attacks. Did you know that many of the concentric features used in late medieval European castles were refined by architects who served in the Crusader states and then returned home with new ideas on layered defense? ## 3. Siegecraft: Techniques and Objectives ### Primary objectives in sieges - Besiege to force surrender, capture territory, or eliminate a garrison. - Two main approaches: 1. Starvation/blockade: isolate and wait for the defenders to run out of food and morale. 2. Breach and assault: use engines and mining to create a gap in walls, then as