Related Clues:
- Irrupt
- Encroach upon
- Arrive en masse
- Become an occupying force
- Board en masse
- Enter forcibly
- Push at the front?
- Storm into
- Board as a group
- Intrude upon, as one's space
- Penetrate harmfully, country or body
- Penetrate other country with armed forces
- Enter other's territory aggressively
- Attack and move in
- Enter with armed forces to attack