Life Under Siege: How Medieval Towns Held On
▶ Play free nowNo install · phone & PC · 3–4 min per runA medieval siege was not one great battle but weeks or months of endurance. Ordinary people inside the walls fought fire, hunger, dirty water and rumour far longer than they dodged stones. This page draws on published historical sources (Britannica, English Heritage, Maurice Keen's The Laws of War in the Late Middle Ages) and today's first-aid and water-safety guidance (Red Cross, WHO, CDC). The medical parts are history; if you are injured or ill, always follow medical professionals.
1. How towns were attacked: stones, fire and the ground below
- Trebuchets and early cannon: in late-14th-century French sieges, counterweight trebuchets were joined by early cannon (bombards). At the siege of Saint-Sauveur-le-Vicomte in 1375, cannon sent from Paris battered the walls with stone balls.
- Fire: one fire arrow could set a thatched roof alight. Burning roofs were torn down with fire-hooks to cut the fire's path, and London banned thatched roofs after its great fire of 1212.
- Mining: attackers dug tunnels under the wall and burned the props to bring it down. Defenders are said to have set bowls of water on the floor and watched for ripples to find the tunnels (mostly told in popular histories; primary sources are scarce).
2. The truth about boiling oil
The movie image of defenders pouring boiling oil from the battlements was rare in reality. Oil was costly and hard to heat; on the walls, water (to fight fires), hot sand and quicklime were more common (English Heritage). Boiling oil was used more often in treating wounds: until the 16th century surgeons seared wounds with boiling oil or hot irons to “burn out the poison”. In 1537 the French army surgeon Ambroise Paré ran out of oil, dressed wounds with a salve instead, saw those soldiers heal better, and abandoned the practice (Britannica).
3. Hunger and the “useless mouths”
The longer a siege lasted, the more grain became the real weapon. During the siege of Rouen in 1418–19 the city expelled thousands of old, sick and poor people to save food — but the besiegers would not let them through, and they were trapped in the ditch between the walls and the siege lines, starving (Britannica). Expelling them was no solution. Some merchants hoarded grain and raised prices, so rationing and fair sharing were part of holding the town.
4. Deadlier than swords: dysentery
In sieges, dysentery (“the flux”) was a great enemy on both sides of the wall. At the siege of Harfleur in 1415 it spread through the besieging English army and laid many soldiers low. People blamed “bad air” (miasma) and burned incense, but the real cause is contaminated water and food.
- Today: if you are not sure water is safe, boil it (CDC).
- Wash hands often and keep latrines away from drinking water (WHO).
5. Wounds then and now
- Then: searing with boiling oil or hot irons; bloodletting for fever.
- Now: press a bleeding wound hard and long with clean cloth, rinse with clean water and cover it. Draining blood or adding burns to an injured or feverish person can cause shock (Red Cross first aid). Get serious wounds to medical help.
6. Surrender and talks: the customs of medieval war
Late medieval war had customs. A town that surrendered on agreed terms was, as a rule, not sacked; a town that refused and was taken by storm could be (Keen; Lieber Institute, West Point). Captured enemies were often ransomed rather than killed. The rumour that “they'll kill us all if we surrender” pushed people toward far riskier choices, such as climbing the walls at night.
7. Lessons you can use today
- When fire spreads, the first minutes — and cutting its path — matter most.
- Press wounds with clean cloth; first aid beats folk remedies.
- Boil water or drink only safe water.
- In a crisis, check rumours against official announcements.
- A community that shares instead of expelling its weakest saves more people.
You can make these choices yourself in the game “A Medieval Siege Night”. Between the beliefs of the age and the answers we know now — can you last until dawn?
FAQ
Did medieval defenders really pour boiling oil?
Rarely. Oil was expensive and hard to get; English Heritage notes that water, hot sand and quicklime were more common on the walls.
What killed the most people in a siege?
Hunger and disease such as dysentery mattered as much as fighting. At Harfleur in 1415, dysentery spread badly even among the besieging army.
What were the “useless mouths”?
The old, sick and poor whom a besieged town expelled to save food. At Rouen in 1418–19 the besiegers would not let them pass, and they starved in the ditch outside the walls.
How were wounds treated in the Middle Ages?
Sometimes by searing with boiling oil or hot irons, and by bloodletting. In 1537 Ambroise Paré saw that unseared wounds healed better and changed the practice. Today you press with clean cloth and get medical help.
Did besiegers kill everyone if a town surrendered?
Under late medieval custom, a town that surrendered on terms was generally not sacked. The danger came when a town refused and was taken by storm.
How did defenders find enemy tunnels?
By watching for ripples in bowls of water set on the floor, or listening for picks underground — though this is mostly told in popular histories and primary sources are scarce.
Can I follow the medical information here?
It contains history and only basic first-aid principles. If you are injured or ill, always follow medical professionals and official guidance.