This castle has existed for centuries.

We installed fire alarms to defend our house against fire.

The inner enclosure of this castle was very strong, and it was an important defense line to prevent enemy invasions.

Please follow this line.

They started the invasion at dawn.

They invaded the enemy's country.

He contributed to the team's defence.

He defended his opinion.

This bridge is very strong, it will last for hundreds of years.

This bridge is very strong, it will last for hundreds of years.