were fortifying
-estuviste fortificando
Past progressive conjugation of fortify. There are other translations for this conjugation.

fortify

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There they hunted out the necessary rifle ammunition, shells, guns, horses and harness and wheeled the improvised batteries into positions which they were fortifying at the same time.
Hay que cazaban la munición rifle necesario, proyectiles, armas, caballos y arneses de ruedas y las baterías improvisados en posiciones que fueron fortaleciendo al mismo tiempo.
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