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Use "forts" in a sentence
"“It is true that Faery hills are sometimes known as forts,” she said."
"The numbers facing each other at Puebla did not appear to hold out any hope for Zaragoza, who dug his forces into defensive positions centered on the twin forts of Loreto and Guadalupe."
"One of the most extensive of these forts is Vercovicium (now known as Housesteads), where there is also a small museum."