estaban devastando
-they/you were devastating
Imperfect progressiveellos/ellas/ustedesconjugation ofdevastar.

devastar

El califa al-Mutadid (r. 279-289 / 892-902) lo eligió para frenar el avance de las tribus nómadas hostiles que estaban devastando la región de Anbar en el Éufrates medio.
He was appointed by the Caliph al-Mutadid (r. AH 279–89 / AD 892–902) to hold back the hostile nomadic tribes that were devastating the region of Anbar in the Middle Euphrates.
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to dive