From Longman Dictionary of Contemporary Englishinvaderin‧vad‧er /ɪnˈveɪdə $ -ər/ noun [countable] PMa soldier or a group of soldiers who enter a country or town by force in order to take control of it Invaders ransacked the town.
Examples from the Corpus
invader• It is dominated by the imposing Citadelle de Vauban, constructed in 1549 to defend the island against invaders.• In some people, the system makes mistakes and wrongly identifies an innocent substance as an invader.• Or stroll up to one of the distinctive sentry boxes, aligned so defenders could harass would-be invaders with a withering cross-fire.• It can't be organised in the presence of invaders.• WordPerfect executives came to view Novell executives as rude invaders of the corporate equivalent of Camelot.• From the hall behind them they could hear the commotion as their comrades and the invaders fought hand to hand.• Some say the invaders wear short pants.• In the long run, both absorbed their invaders, but at very great cost. 