invading

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

Hitler invaded Poland on September 1, 1939

to intrude upon, infringe, encroach on, violate

This new colleague invades my territory

occupy in large numbers or live on a host

the Kudzu plant infests much of the South and is spreading to the North

penetrate or assault, in a harmful or injurious way

The cancer had invaded her lungs

involving invasion or aggressive attack

invasive war