He adopted a nom de guerre to protect his true identity.

Many soldiers in history have used noms de guerre to protect their true identities.

They used clever ruses de guerre to deceive the enemy.

The general used a ruse de guerre to deceive the enemy.

He adopted a nom-de-guerre during the war.

He is known by his noms-de-guerre in the underground world.

My friend's last name is Guerrero.

Guerrero is a beautiful state in Mexico.

Las Guerreras lucharon valientemente en la batalla.

My friend's last name is Guerrera.