The soldiers will defense the city from invaders.

To protect or support against attack or harm.
We must defense our borders.
He will defense his family.
They defense the weak.
defense against
defense the attack
defense the country
protect
guard
shield
The castle's strong walls provided excellent defense against invaders.

The action of defending or protecting from harm or attack.
The team's defense was very strong.
We need a good defense against the virus.
Her legal defense was successful.
strong defense
national defense
self-defense
protection
guard
security