侵略

The whole nation took up arms against aggression.

aggression and expansion

external aggression

armed aggression

economic/cultural/religious invasion

aggressive policy

aggression; act of aggression; aggressive act (against a country)

aggressive nature

be aggressive by nature

rise to resist aggression

protect the country against invasions

carry out an invasion

repel an invasion

resist/combat aggression

start an aggression; launch an invasion

resist aggression