invade

To intrude upon, infringe, encroach on, violate.

“This new colleague invades my territory”

March aggressively into another's territory by military force for the purposes of conquest and occupation.

“Hitler invaded Poland on September 1, 1939”

Occupy in large numbers or live on a host.

Penetrate or assault, in a harmful or injurious way.

“The cancer had invaded her lungs”