Infantry
Infantry is a broad Age of Empires III unit tag, not a single battlefield role. It covers several foot-unit classes with different weapons and counter relationships. The Heavy Infantry and Light Infantry branches are useful starting points, but heroes, support units and unusual specialists can carry the Infantry tag without either subtag.
Heavy and light infantry branches
Read a unit’s full tag set before choosing a counter. Heavy Infantry contains Hand Infantry (including Pikemen), Musket Infantry and Grenade Troopers; Light Infantry contains Foot Archers, Rifle Infantry and Hand Skirmishers. Shock Infantry behaves more like Cavalry in its role and counters, but is a separate class and does not carry the Infantry tag. Siege Troopers and Artillery are also separate tags.
Other units carrying Infantry
Use the classification to understand which attack multipliers may apply, then confirm the individual unit’s tags and damage values. Some Cavalry and Artillery units, including examples such as Lancers, Mahouts, Falconets and Heavy Cannons, have bonuses against units tagged as Infantry. A broad label does not guarantee the same multiplier for every attacker or mean that every Infantry unit is vulnerable to the same counter.
The two main branches
Heavy Infantry divides into Hand Infantry, Musket Infantry and Grenade Troopers; Pikeman is a further tag beneath Hand Infantry. Light Infantry divides into Foot Archers, Rifle Infantry and Hand Skirmishers. These are player-facing categories used to describe unit families and apply relevant counter bonuses. A unit may also have additional tags, so two units in the same branch are not automatically identical in range, attack type, speed or target bonuses.
Infantry-tagged does not always mean heavy or light
The Infantry list also includes units that lack both the Heavy Infantry and Light Infantry tags. Examples span leaders and support units such as the Aztec War Chief, Explorer, Drummer, Padre, Warrior Priest and Griot, as well as specialized troops such as Mantlets, Flamethrowers, Irregulars, Spies and Urumi Swordsmen. Their shared Infantry tag can matter to an attacker’s bonus even when their battlefield jobs have little in common with a Musketeer or Skirmisher.
Shock Infantry is a separate counter class
Shock Infantry units fill cavalry-like roles and have similar counter relationships, but they are not Infantry-tagged. Do not infer their classification from a human-sized or foot-based appearance. Likewise, a unit shown in a skirmisher-related list may have another primary class: Mounted Rifleman is a Cavalry unit, not Infantry. Check the unit’s own entry when an exception affects an army matchup.
Player-facing names and internal tags can differ
The Wiki identifies Infantry as the AbstractInfantry tag in the game files. Internal identifiers are not always named like the visible class tree: AbstractLightInfantry can refer to Shock Infantry, while AbstractSkirmishers is associated with the player-facing Light Infantry group. These implementation names are useful when interpreting files or mod data, but players should use the visible unit tags and the current edition’s profile when planning counters.
How to apply the classification in a battle
First identify the enemy unit’s tags, then inspect the bonus for the attacking unit against those tags rather than relying on a generic “anti-infantry” description. A mixed force may include a Heavy Infantry frontline, Light Infantry at range and separate siege support; protect each group according to its role. If the opponent adds shock units, switch to the appropriate anti-Cavalry response instead of treating them as another Infantry branch. The individual pages for linked units provide their specific attacks, resistances and modifiers.