raider
noun
[ ˈreɪdə ]
• a person who attacks an enemy in their territory; a marauder.
• "Scandinavian raiders put down their roots in Cumbria"
Similar:
attacker,
assailant,
robber,
burglar,
thief,
housebreaker,
plunderer,
pillager,
looter,
marauder,
ransacker,
sacker,
invader,
holdupper,
reaver,