The heavy Infantry with more defense and relatively less attack, can easily defeat any unit from previous age. Even  the archer from the iron age, if they arent in great numbers. With increased speed they can catch up crossbowmen now. Not recommended to attack crossbowmen with heavy because of their newfound defense value of 10 and extra defense value of 6 make them more durable and make the heavy infantry to attack them at least 3 times. Their attack value of 15 is the same as the knight, which make the fast be a serious threat to the heavy, even with their defense value of 22.
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