Rifleman

medium
piercing attack on ground units
piercing attack on air units

Damage taken by Rifleman (medium armor)

150% from normal attack

Peon Grunt Tauren

75% from piercing attack

Troll Headhunter Wind Rider Kodo Beast

75% from magic attack

Shaman Witch Doctor Spirit Walker

50% from siege attack

Demolisher Raider Troll Batrider

Damage dealt by Rifleman (piercing attack on ground units)

150% to unarmored armor

Shaman Witch Doctor Kodo Beast Spirit Walker

100% to heavy armor

Grunt Tauren

75% to medium armor

Peon Troll Headhunter Raider

Damage dealt by Rifleman (piercing attack on air units)

200% to light armor

Wind Rider Troll Batrider