Plan of Mud Island
The key reads: "1. Morass. 2. Embankments with pits. 3. Blockhouses for heavy implements. 4. Barracks of wood with loopholes 5. Embankments 6. Governor's house. 7. Walls of squared stones, in front of which lay two ditches between which was a berm that was palisaded, 8. Blockhouses. 9. Battery with heavy guns. 10. A curved bastion with ditches."