foram destruídos

were destroyed

→ ser
phrase Rare #38,158
were destroyed A passive construction used with plural masculine nouns or mixed-gender groups. The verb form agrees with what was destroyed.
PO: Dois dos navios inimigos foram destruídos.
EN: Two of the enemy ships were destroyed.

Os muros da cidade foram destruídos.

The city walls were destroyed.

Dois dos navios inimigos foram destruídos.

Two of the enemy ships were destroyed.

Os navios deles foram destruídos.

Their ships were destroyed.

— O Barco: Inferno no Mar (1981)

O altar, junto com velhos documentos, foram destruídos.

The altar, along with old documents, was destroyed.

— Your name. (2016)

Sete veículos foram destruídos.

Seven vehicles were destroyed.