estaban fortificando
-they/you were fortifying
Imperfect progressiveellos/ellas/ustedesconjugation offortificar.

fortificar

Dos semanas después de desembarcar en Inglaterra, los orcos normandos habían dejado de quemar pueblos y ahora estaban fortificando una parte de nuestro amado Sussex.
Two weeks after landing in England, the Norman orcs had pulled back from their village-burning and were now fortifying a peninsula of our beloved Sussex.
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