The fortification was also one of only nine examples constructed in the United States to have a moat, being essentially surrounded on all sides by water and accessable only by a retractable drawbridge from the land side.
The fortification was also one of only nine examples. These only nine examples were constructed in the United States. This was to have a moat and accessable only by a retractable drawbridge from the land side. A moat was being essentially surrounded on all sides by water.