 During the Civil War Rey d'Harcourt was the commander of the Nationalist garrison of the city of Teruel during the Battle of Teruel.Heavily outnumbered, Rey d'Harcourt made a last stand in four key points of the city; the Civil Governor's Building, the Bank of Spain, the Convent of Santa Clara and the Seminary.Republican Radio Barcelona announced that Teruel had fallen, but Rey d'Harcourt and the remnants of the 4,000 man garrison still held out.