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The digging of moats served two purposes. In early castles they provided a huge obstacle to attackers before they could reach the actual walls; the soil taken from the moat would be used to construct the mound known as the motte on which the main tower was built, as well as providing banks on the inner side of the moat.

In later castles the main purpose was as an obstacle to attackers, but also to help guard against mines being dug under the walls.

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13y ago

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