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 ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.