Logistics of Medieval Armies

In 1346, King Edward III landed roughly 14,000 soldiers in Normandy on the way to the Battle of Crécy. Historians estimate that army alone needed close to 14 tons of grain every single day just to feed the human soldiers — before counting the thousands of warhorses, each of which needed about 20 pounds of feed daily. A medieval army wasn't just a collection of knights and swords. It was a moving city that had to eat, drink, and stay healthy every single day, or it would collapse before ever reaching a battlefield.

- Why feeding an army was often harder than fighting with it - What a baggage train was and who traveled inside it - How medieval commanders paid and organized their soldiers - How far a medieval army could realistically march in a day

Armies fed themselves two ways: foraging (soldiers spreading out to take food, animals, and firewood from the local countryside) and a baggage train of supply wagons carrying grain, salted meat, and ale from home. Foraging was faster but devastating to the region it passed through, often destroying a season's harvest for the farmers who lived there — which is exactly why chevauchée raids (deliberately destructive marches through enemy territory) were used as a weapon in the Hundred Years' War, not just a supply method. Warhorses made the food problem worse: a single knight's destrier needed roughly ten times the food of a soldier, so an army of a few thousand knights could require the daily equivalent of feeding tens of thousands of people.

Trailing behind the fighting force was a baggage train that could stretch for miles: ox-carts loaded with tents, siege equipment, and food, alongside blacksmiths to reshoe horses, fletchers to repair arrows, cooks, chaplains, and often merchants selling goods to the soldiers. This non-combat population, sometimes called camp followers, could equal or outnumber the actual fighting men. At the 1415 Agincourt campaign, King Henry V's baggage train was attacked during the battle itself — a reminder that the supply chain was as much a target as the soldiers.

By the 1300s, many English soldiers weren't feudal levies fighting for free out of loyalty — they were paid professionals hired under written indenture contracts that specified wages, length of service, and a share of any plunder or ransom money from captured enemy nobles. A captured French lord could be worth a fortune in ransom, which is why capturing wealthy enemies alive was often more profitable to a soldier than killing them. When wages ran late, which happened often because medieval kings frequently ran out of money mid-campaign, armies mutinied or simply went home.

A medieval army on foot typically covered 12-20 miles on a good day, slower through mud, forest, or mountains, and much slower when a heavy baggage train and siege engines came along. Rivers mattered enormously — armies planned routes around fords and bridges, and supplies moved much faster by boat than by cart wherever a navigable river was available. A commander who misjudged the terrain or supply route could arrive at a battlefield with an army too hungry and exhausted to fight, no matter how skilled the soldiers were.