Age of Empires Series Wiki
Projectile dup prev

Projectile duplication is a game mechanic present in the Genie Engine, although it did not appear in the original Age of Empires or its expansion.

When a unit or building releases multiple projectiles instead of one, it is possible that only one of its projectiles will do damage according to the attacking unit's stats, while the rest of the projectiles will deal damage according to the projectile's own attack stats, which can be upgraded (or not upgraded) by relevant technologies. Because of this, discrepancies exist between displayed attack and actual damage dealt by projectile duplicating units or buildings.

The way projectiles work is either all projectiles fired are primary projectiles, or only one projectile is primary projectile while others are secondary. Only the primary projectile is affected by hill and cliff bonuses. Primary projectiles carry the attack of the unit, whereas secondary projectiles have their own attack stats, and always belong to the player, even if the unit is converted. Explaining the last point in other words, a converted Watch Tower can fire Keep-strength projectiles if the player has Keep researched; or a converted Keep can fire Watch Tower-strength projectiles if the player does not have Guard Tower researched.

Units and buildings using primary projectiles[]

Note: To achieve this behavior, set secondary projectile as -1. It does not work with setting secondary projectile the same as primary projectile.

Buildings using almost the same projectile[]

These buildings have base attack of the secondary projectile the same as the primary one, but have different attack bonuses.

Units and buildings using different projectiles[]

  • ChukoNuIcon-DE Chu Ko Nu and Kipchakicon Kipchak - They fire 2 additional projectiles which deal 3 pierce and 0 melee attack.
  • Kipchakicon Elite Kipchak - The extra 3 additional projectiles deal 3 pierce and 0 melee attack.
  • ChukoNuIcon-DE Elite Chu Ko Nu - They fire 4 additional projectiles which deal 3 pierce and 0 melee attack.
  • Mangonel aoe2DE MangonelOnager aoe2DE OnagerSiege onager aoe2DE Siege Onager - The extra projectiles have no damage. Hence they deal the minimum damage when not using attack ground. The Mangonel, Onager, and Siege Onager fire five, seven, and nine additional projectiles respectively.
  • Skirmisher aoe2DE SkirmisherElite skirmisher aoe2DE Elite SkirmisherImperialskirmishericon-DE Imperial Skirmisher and GenitourIcon-DE GenitourGenitourIcon-DE Elite Genitour - With Hul'che Javelineers, the Skirmisher line gains an extra projectile which deals 1 pierce attack.
  • Galley aoe2DE GalleyWar galley aoe2DE War GalleyGalleon aoe2DE Galleon - The Armenian Galley line fires an additional projectile which deals 1 attack vs ships and camels. Hence, it deals 1 damage to these units in all cases, and 1 damage to units and buildings other than these if not a mishit.
  • Harbor aoe2de Harbor and LongboatIcon-DE LongboatLongboatIcon-DE Elite Longboat - Uses the same projectile as the Galley line, but fires three additional projectiles instead of one.
  • Scorpion aoe2DE Scorpion and Ballistaelephanticon-DE Ballista ElephantBallistaelephanticon-DE Elite Ballista Elephant - With Double Crossbow researched, they gain a secondary projectile which deals 6 pierce attack, +3 vs elephants, and +1 vs buildings, in addition to pass-through damage.
  • Heavyscorpion aoe2DE Heavy Scorpion - With Double Crossbow researched, Heavy Scorpions gain a secondary projectile which deals 8 pierce attack, +4 vs elephants, +2 vs buildings, and +1 vs rams, in addition to pass-through damage.
  • Aoe2-icon-hussite-wagon Hussite Wagon - Hussite Wagons fire five additional projectiles which deal 4 pierce attack, +3 vs buildings, and +3 vs rams.
  • Aoe2-icon-hussite-wagon Elite Hussite Wagon - Elite Hussite Wagons fire five additional projectiles which deal 6 pierce attack, +3 vs buildings, and +3 vs rams.
  • Aoe2de Thirisadai Thirisadai - The Thirisadai fires four additional projectiles which deal 1 pierce attack.
Note: As a coincidence, these projectiles do not benefit from any attack upgrades.

Special cases[]

The Town Center and Fortified Church do not fire any primary projectile. All of their projectiles are secondary. They share the same projectile, which deals 5 pierce attack, +5 vs buildings, +5 vs ships, and +1 vs camels. These projectiles are affected by attack upgrades. They can fire maximum 10 (15 for Teutons) and 5 projectiles respectively.


In the context of the above:

Gameplay elements in the Age of Empires series
Age · Ability (II · M · III · IV) · Architecture set (II · III) · Area of Effect (Trample damage) · Armor/Resists (hack/melee · pierce/ranged · crush/siege)  · Armor class/Tag (I - original · I - Return of Rome · II · IV) · Artificial intelligence · Attack (Attack bonus/Multiplier) · Attack delay · Attack ground · Aura (IV) · Auto Scout · Building (I · II · M · III · IV) · Civilization (I · II · M · III · IV) · Civilization bonus · Cheat code (I · II · M · III · IV) · Conversion · Counter · Diplomacy · Gaia/Mother Nature · Game modes · Garrison · Gather Point · Healing · Hit points · Hotkey · Line of Sight · Mini map · Player · Population · Range · Rate of Fire · Regeneration · Relic (II · M · IV) · Repairing · Resource (Renewable resources) · Scenario Editor (I · II · M · III · IV) · Score · Signal Allies/Flare · Soundtrack (I · II · M · III · IV) · Speed · Stealth mode · Taunt · Technology (I · II · M · III · IV) · Technology tree (I · II · IV) · Town Bell · Trade (IV) · Tribute · Unit (I · II · M · III · IV) · Unit formation · Unit stance (III) · Upgrade (I · II · III · IV) · User interface · Victory · Villager Priority
Genie Engine
Frame delay · Full Tech Tree · Team bonus
ReturnRome-AoEIcon Age of EmpiresRuins · Discovery
AoE2-DLCicon-0 Age of Empires IIPass-through damage · Projectile duplication
Bang Engine
Autoqueue · Snare
Aom original icon Age of MythologyGod (Major · Minor) · God power · Settlement
3Icon48px Age of Empires IIIAge-up methods (Politician/Tribal Council/Wonder/Federal State/Alliance· Banner army · Consulate · Damage Cap · Home City · Home City Card · Inspiring Flag · Minor civilization · Nuggets · Promotion · Revolution · Target Lock · Trade Monopoly · Trade Route · Treasure
Essence Engine
GameIcon-AoE4 Age of Empires IVBounty · Dynasty · Fire armor · Imperial Council (Vizier Point) · Influence · Landmark · Religion · Sacred Site · Variant civilization
If a gameplay element has different pages across games, like civilization, the individual pages are linked in brackets.