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NotesHistoryTopic 7.2Warfare in practice — the Crusades
Back to History Topics
7.2.24 min read

Warfare in practice — the Crusades

IB History • Unit 7

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Contents

  • Two very different armies meet
  • Sieges and castles win the war
  • Supply, disease and the enemy who adapted

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The big idea: When the crusaders reached the Middle East, they met an enemy who fought in a completely different way.

The crusaders' battles were shaped less by huge set-piece clashes and more by sieges, castles, supply and survival — and by how well each side could adapt to the other's style of war.

The First Crusade set out in 1096 after Pope Urban II called on Christians to recapture Jerusalem from Muslim rule.

The fighters who answered were mostly from France, Germany and Italy, and they brought the way of war they knew from home.

The Western (crusader) way of war

  • Heavy cavalry — armoured knights on strong horses, charging in a tight mass
  • The charge could shatter an enemy line in one terrifying shock
  • Foot soldiers (infantry) with spears and crossbows protected the knights
  • Best in a straight, head-on fight — but slow, heavy and tiring in the heat

The Turkish (Muslim) way of war

  • Light, fast horsemen — the famous mounted archers
  • Rode in, fired arrows, then wheeled away before knights could reach them
  • Used speed and space to wear an enemy down rather than crash into him
  • Could feign retreat, then turn and surround a strung-out enemy

This mismatch defined the fighting. A crusader charge was almost unstoppable if it could catch the enemy.

But Turkish mounted archers rarely stood still to be caught — they harassed the crusaders with arrows from a distance, aiming to break up the formation and exhaust the horses.

The problem in one image: Imagine a heavy boxer chasing a nimble runner who keeps darting in to land a jab and then sprinting away.

The crusaders were the powerful boxer; the Turks were the runner. Whoever controlled the pace of the fight usually controlled the outcome.
Why discipline mattered: Crusaders learned that they had to keep their formation tight and their infantry screen in front, absorbing arrows until the moment came to charge.

When they held together they could still win. When they broke ranks to chase the archers, they were often destroyed.

Battles in open country were rare and risky. The real prizes of the crusades were cities and fortresses — and taking them meant siege warfare.

A siege could last weeks or months and often decided the whole campaign.

Why sieges were decisive: You could not simply defeat an enemy in one field battle and claim the Holy Land.

To actually hold territory you had to capture the walled cities that controlled the roads, ports and countryside — so whoever won the sieges won the war.
1

Antioch, 1098 — the near-disaster

The crusaders besieged the great city of Antioch for eight brutal months, starving outside its walls. They finally got in through treachery when a guard let them over the wall. Then a huge Muslim relief army arrived and besieged THEM inside the city — until, half-starving, they marched out and won an astonishing victory.

2

Jerusalem, 1099 — the goal reached

The crusaders reached Jerusalem exhausted and short of water in the summer heat. They built siege towers and ladders from timber brought by sea, stormed the walls in July 1099, and captured the city — followed by a notorious massacre of its inhabitants.

Antioch 1098 → Jerusalem 1099: two sieges that decided the First Crusade.

Winning a city was only half the challenge. A few thousand crusaders now had to hold a strip of land surrounded by far larger Muslim populations.

Their answer was to build some of the strongest castles the medieval world had ever seen.

Krak des Chevaliers — the fortress that held: The most famous crusader castle, Krak des Chevaliers in Syria, was held by a military order of knights.

With huge concentric (double-ring) walls and its own water and food stores, a small garrison could defy a whole army — it was besieged many times and rarely fell.
  • Force multiplier — a strong castle let a few hundred defenders resist thousands, making up for the crusaders' small numbers
  • Control of land — castles guarded roads, borders and coastlines, so holding them meant holding the surrounding region
  • Safe bases — they stored supplies and sheltered armies, letting crusaders survive between campaigns
  • Slow to fall — thick concentric walls meant an attacker needed time, engineers and huge effort to break in
The pattern of crusader warfare: Take a city by siege, then build castles to keep it. This was how a small number of Western settlers held the Levant for nearly two centuries.

When they later lost their castles, they lost the whole region with them.

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Marching an army 3,000 miles to a hot, dry land was as dangerous as any battle.

More crusaders died from hunger, thirst and disease than from enemy weapons — so logistics decided who could keep fighting at all.

  • Distance — the overland march across Europe and Anatolia took many months and wore armies down before they ever reached the enemy
  • Climate — the fierce heat and lack of water in Syria and Palestine killed men and horses, especially those in heavy armour
  • Disease — camps packed with people bred illnesses like dysentery and typhoid that could destroy an army from within
  • Food and fodder — feeding thousands of men and horses in enemy land was a constant crisis; a starving army could not besiege anything
The Italians solve the supply problem: The crusaders could not have survived without help by sea. The Italian city-states — Genoa, Pisa and Venice — provided the ships.

Their fleets carried soldiers, food, timber and weapons to the coast, and blockaded enemy ports. In return the Italians won rich trading privileges in the captured cities.
Sea power at Jerusalem: At the siege of Jerusalem in 1099 the crusaders had no timber for siege towers in the bare hills.

Genoese ships that had landed at the coast were broken up, and their wood was hauled inland to build the towers that finally cracked the walls — a perfect example of naval support deciding a siege.

The greatest challenge of all, though, was that the Muslim side learned and adapted.

Early crusaders faced divided Muslim rulers, but over time strong leaders united the Muslim world and turned the tables — none more than Saladin.

Saladin and the Battle of Hattin, 1187: Saladin united Egypt and Syria and drew the crusader army onto ground of his choosing.

At the Battle of Hattin in 1187, he lured them across a waterless plateau in blazing heat, then surrounded the parched, exhausted crusaders and destroyed their army. Days later he retook Jerusalem itself.
Why Hattin mattered so much: Hattin shows how tactics beat brute force. Saladin did not smash the crusaders head-on — he used thirst, heat and terrain to break them before the fighting even peaked.

By shattering the crusader field army, he left their castles and cities defenceless, undoing almost everything the First Crusade had achieved.

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Related History Topics

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7.1.1A framework for the causes of medieval wars
7.1.2Causes case study 1 — the Crusades (Middle East)
7.1.3Causes case study 2 — the Hundred Years' War (Europe)
7.2.1How medieval wars were fought
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