[E.C. McCullough and Co.],
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INTERESTING MANILA 2 7
forty-five feet of earth with a thin retaining wall of soft stone. The parapet nowhere exceeds sixteen feet of soft tufa with its core of earth.
The moats presented their own problems of construction, as the land was little better than a marsh, and the weight of the walls made necessary the paving of the bottom of the moat with firm material. The bottom was made with a long slope at the foot of the scarp low enough to be under water.
While the old walls would be of no use in a modern siege, and were too weak to withstand the attack of the British in 1762 without being
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