The image and the reality
Popular images show armored riders thundering across a field and sweeping everything aside. Real cavalry was more varied and more limited. Mounted knights were powerful when used well, and they were central to many armies, especially from the 10th to the 13th centuries. But they were expensive, vulnerable in certain conditions, and rarely won battles alone.
Horses and equipment
A war horse was costly to buy, feed and transport, which is one reason knighthood became tied to wealth and landholding. Knights normally owned or were provided with several horses: one for battle, others for travel and baggage. Breeding and training mattered, though the exact types of war horses are often disputed, and medieval terms such as destrier covered varied animals.
A knight’s gear included a lance, sword, shield and defensive armor. Early on, mail shirts, a helmet and a kite-shaped shield were typical. By the 14th and 15th centuries, plate armor protected more of the body, and horses might also wear protection. The weight of this kit meant that knights fought best when they were fresh and had time to prepare.
Saddles with high fronts and backs, and stirrups, helped riders stay mounted when braced for impact. Historians debate how much these innovations changed warfare and when the couched lance became common, so claims that stirrups alone created feudal knights are best treated as oversimplified.
The charge
The charge was the knight’s signature attack. Riders started at a trot to keep formation, then increased speed over the final stretch, trying to hit the enemy together. A tight group had greater weight and morale than scattered individuals. The goal was to open gaps in the enemy line that followers could exploit.
The charge was effective against troops that were disorganized, tired, outflanked or already wavering. Its effect was partly psychological: facing a mass of horsemen could cause untrained infantry to flee before contact. Experienced soldiers who held firm could be a different matter, which leads to the main limitations.
Limits of cavalry
- Defensive infantry. Dense formations of spearmen could stop a charge, since horses are reluctant to run into a hedge of points. Scottish forces at Bannockburn and Flemish townsmen in some fights showed this.
- Missile fire. Arrows and bolts wounded unprotected horses, throwing riders. Stakes and ditches added further obstacles.
- Terrain. Mud, slopes, marsh, woods and narrow fronts removed a charge’s advantages. Wet ground at Agincourt is commonly noted, though the exact conditions are debated.
- Cost and fatigue. Armored horses tired quickly, and losing a horse was a financial blow.
- Control. Once launched, a charge was hard to steer or recall, and eager riders might pursue too far.
For these reasons, commanders in the 14th century often made knights dismount and fight on foot in defensive positions, keeping a smaller mounted force for pursuit or flank attacks. This was a tactical choice, not an admission of failure.
Cavalry beyond the charge
Mounted troops did much more than charge. They scouted, screened marching armies, escorted supplies, carried messages, and raided enemy land. In raiding, mounted columns could cover ground quickly, which made them ideal for hit-and-run attacks. After a battle was decided, cavalry pursuit often caused the heaviest enemy losses.
Light cavalry played significant roles in many armies. Steppe and Islamic forces made extensive use of mounted archers, and Byzantine forces used both heavy and light horsemen. In the Latin West, knights were supported by sergeants and mounted retainers who were less heavily equipped.
Cavalry could also fail when used rashly. At the Battle of Manzikert in 1071, a Byzantine army was defeated by Seljuk forces in a campaign involving mobile horsemen and difficult supply, with the emperor captured. At Las Navas de Tolosa in 1212, Christian armies in Spain combined cavalry and infantry against a Muslim army and won a major victory. Those two outcomes illustrate how organization, scouting and coordination mattered as much as individual fighting skill.
Working with other troops
Effective commanders used horsemen together with other arms. Archers could break up the enemy before a charge. Infantry could hold the center while cavalry went around the flanks. Dismounted men-at-arms gave a battle line backbone, while mounted troops watched for chances. Armies that left their knights to act alone often paid for it.
This combined approach is visible in the later Middle Ages. English armies pairing archers with dismounted men-at-arms could beat larger, mostly mounted forces. The French response was to adapt too, with more infantry and crossbowmen, and later with professional companies and artillery.
Status as well as function
Cavalry also carried social meaning. Fighting on horseback marked a man as a knight and a member of the elite, and tournaments and jousting lists celebrated mounted skill. This attachment to status sometimes made nobles reluctant to dismount or accept tactics seen as lower in rank. Yet commanders who were willing to adapt did so, and mounted knights remained important in armies for centuries, even as their relative importance changed.