noun
invading army
Refers to a military force that enters a territory by force, typically in the context of war or invasion.
侵入軍が国境を越えた。
The invading army crossed the border.
住民は侵入軍に抵抗した。
The residents resisted the invading army.
侵略軍 emphasizes aggressive invasion and conquest, while 侵入軍 focuses on the act of entering by force.
Compound of 侵入 (invasion) + 軍 (army).