Archery Units
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Archer
Good at killing infantry and villagers.  Quick, light. Weak at close range, excels at battle from a distance.
Created at Archery Range.
Strong vs. Barracks Units, cavalry archers, Monks, Teutonic Knights, War Elephants
Weak vs. Knights, Skirmishers, Mangonels, Woad Raiders, Huskarls
Upgrades:
Attack, Range: Fletching, Bodkin Arrow, Bracer (Blacksmith)
Attack: Chemistry (University)
Targeting: Ballistics (University)
Armor: Padded Archer Armor, Leather Archer Armor, Ring Archer Armor (Blacksmith)
Skirmisher
Anti-archer ranged unit similar to the slinger. Very weak to everything but archers.  Ranged unit equipped with armor against archer attacks.
Created at Archery Range
Strong vs. archers, cavalry archers.
Weak vs. Stable units, siege weapons, infantr
Upgrades:
Attack, Range : Fletching, Bodkin Arrow, Bracer (Blacksmith)
Attack: Chemistry (University)
Targeting: Ballistics (University)
Armor: Padded Archer Armor, Leather Archer Armor, Ring Archer Armor (Blacksmith)