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How did heraldry help medieval knights identify friends and enemies in battle?

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Image shows a seal depicting several mythical creatures fighting. — heraldry Cylinder seal impression from the Akkadian period with a combat scene between a bearded hero and a bull-man and various beasts.

In medieval warfare, heraldry served as a vital, utilitarian system for identification. As body armor became increasingly all-enveloping, it became difficult to distinguish individual knights on the battlefield; heraldic symbols provided a necessary solution for identifying friends and enemies at a glance.12

These symbols were primarily displayed on shields, banners, and pennons. Additionally, knights wore a surcoat—a cloth tunic placed over their armor—which repeated the bearer's arms, making them recognizable even when their shields were obscured by mud or gore.321

Because most people were illiterate during this period, heraldry relied on bold, simple, and striking designs that could be recognized quickly. This speed of recognition was critical, as misidentifying a device could lead to fatal consequences, and some battles were lost due to confusion between similar designs on opposing sides. Beyond the battlefield, heralds were responsible for recognizing these arms to identify combatants during tournaments and to account for the dead after conflict.234