Heavy Infantry is a type of infantry units in Rise of Nations. They are the first type of military unit to become avaliable, alongside Light Infantry and Foot Archers, and remain important throughout the game - Unlike other infantry types, their equipment may change, but they never upgrade to a new type. They are trained and upgraded at the Barracks, requiring both Food Food and Metal Metal (Timber Timber instead of Metal Metal in the Ancient Age Ancient Age).

Heavy Infantry units are slow-moving, but very durable soldiers donning heavy armor and having the highest amount of hit points of all infantry. Their main role in combat is to fight cavalry, ranging from mounted units in the early ages to armored vehicles and heavy tanks in the late game. Earlier, melee Heavy Infantry also excels at attacking buildings, doing 1.3 times more damage to them (Except Hoplites), but lose this bonus when upgrading to gun infantry. They can be somewhat effective against Artillery Weapons and Support Units as well, but are very weak when having to fight Foot Archers, Gunpowder Infantry, Modern Infantry, and late game Machine Guns. In the earlier ages, they are also effective against buildings such as Cities, though Artillery Weapons rapidly become superior with each successive age, diminishing their role as besiegers.

Starting out as close-range fighters, mostly with spear and shield, and later pikes, they retain their melee role until the Gunpowder Age Gunpowder Age, protecting the powerful but vulnerable Gunpowder Infantry from the onslaught of cavalry. In the Enlightenment Age Enlightenment Age the Heavy Infantry retains this very role, but now replacing the pike with the flintlock, increasing the unsafe distance for cavalry to approach. In the Industrial Age Industrial Age onwards they become the answer to cavalry's transition from animal to engine, and adopt anti-tank weaponry.

Age Unit
Ancient Age Ancient Age Hoplites
Classical Age Classical Age Phalanx
Medieval Age Medieval Age Pikemen
Gunpowder Age Gunpowder Age Elite Pikemen
Elite Pikemen
Enlightenment Age Enlightenment Age Fusiliers
Industrial Age Industrial Age Anti-Tank Rifle
Anti-Tank Rifle
Modern Age Modern Age Bazooka
Information Age Information Age Anti-Tank Missile
Anti-Tank Missile

Unit costs Edit

Heavy Infantry production cost increases progressively with every Barracks unit on the field or currently in production. The default increase is of 1 Food Food and 1 Metal Metal for the second unit created, increasing further with every new unit until the cost cap is reached, which for military units is +125% of their original base value.