The family established a farm and built a stone house for defense against the Indians.

This was a building built for defense against primarily Indian attacks in frontier areas.

The city was built for defense, and with very little work could be made impregnable.

They hadn't built the place for defense, though.

They therefore built a thick enclosure wall around the city for defense.

Oddly, the ditch is on the inside, suggesting it was not built for defense.

The residents moved the city to the top of the hill and built a castle for defense.

Had Chambord reversed this idea, building these tunnels for defense?

The fort was built inland from the river mouth, partly for defense, and moved several times.

It was not easy to approach, hard to get away from, and was, built for defense.