Fort Paté is a small oval battery on an island in the middle of the river Gironde, just big enough to hold the soldiers who defend it. It was built between 1685 and 1693 as part of the verrou de Blaye, a system of three forts built to seal the river against enemy ships.
The fort was situated so as to support the river batteries at Blaye on the right bank and Fort Médoc on the left bank. The island used to be flooded at very high tides and has varied in size considerably over the years. To prevent the fort from sinking into the muddy ground a special foundation had to be made.
The engineer François Ferry, advised by Vauban, was responsible for the construction of the fort. He constructed a grid of wooden piling, which rests upon wooden stakes, forming a raft. The fort itself was then built on top of this raft.
A similar wooden grid was laid around the island in order to stabilise it. In around 1705, the fort had sunk about two meters into the mud. Although the lower embrasures'were useless the rest of the fort was still useful. In 1730 the island had to be stabilised again because its size had been reduced considerably by the currents of the river. The technique used to make the foundation for the battery is quite common in the region; Brouage, Fort Chapus and the Corderie Royal in Rochefort all have similar foundations.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.