France may have lost the battle of Agincourt because their soldiers’ armour was so heavy it left them breathless, researchers have claimed. Wearing a full suit of armour doubled the amount of energy used in battle, according to a new study in which volunteers dressed as 15th century knights were made to run on a treadmill.

The exertion of carrying the steel plate armour, which weighed between 30 and 50kg, (66-110lb), would have placed additional weight on each limb and hampered the wearer’s breathing, making them weaker in a fight.

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