The player is also responsible for defending his town against invasion by building a military.

Iran defended itself against Iraqi invasion in 1980, a war that lasted eight years.

The shogunate prepared to defend against a third invasion, but it did not come.

"The city-building is a way for the city to defend itself against alien invasion?"

Its defences were strengthened again in the middle of the 17th century to defend against a possible invasion from the east.

During this period, the empire faced challenges in defending itself against foreign invasion and occupation.

Further, an occupant not sure if violence to defend their property against invasion is reasonable, may feel forced to do nothing.

The fluidics may simply believe they're defending themselves against invasion.

The present territory of Iraq lacks significant strategic barriers, making it difficult to defend against foreign invasion.