The Heavy Infantry has the highest defense of all units in the HMA. Continuing the heavy unit trend of past ages, it has a defense and attack multiplier against light units as well as having a defense bonus on plains. It does very well against the Berserker and the Knight, and also has good defense even against the Crossbowman. It gains one more movement point compared to the Armored Infantry of the previous age, so now it has the same movement as the Crossbowman.
The Heavy Infantry is best used as a defense for artillery and ranged units. Due to its slow speed and melee attack it is not particularly effective in attacking. However, due to its improved movement speed it can serve as an attacker when needed.