Answer:

invader

Answer	Crossword Clue
INVADER	Conqueror, often
INVADER	Asian lady beetle, for one
INVADER	Assailant.

INVADER	Aggressive nation.
INVADER	Encroacher.
INVADER	Intruder.
INVADER	Attila, most of the time
INVADER	Hannibal was one
INVADER	Attacking force
INVADER	Napoleon, to a Russian
INVADER	Saxon or Celt, once

INVADER	Attacker
INVADER	Raid participant

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.