1.   The exploits of football hooligans would probably be praised if they were part of resistance to an invading army.

2.   The invading army took every opportunity to humiliate the local peasants.

3.   The towns were looted by the invading army.

4.   Their thunderous charges have broken the back of many an invading army.

5.   ...a force of mobile reserve units that could strike quickly and effectively at the vanguard of an invading army.

6.   The Romans and the Normans came to Britain as invading armies.

7.   They earned a magnificent triumph over the invading army.

8.   The city was overwhelmed by the invading army.

9.   The soldiers tried to neutralize the attack by dividing the invading army.

10.   The village was plundered by the invading army.