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Knockalla Fort is one of several Napoleonic batteries built along the shores of Lough Swilly in county Donegal, to defend the north west of Ireland. It was part of a scheme to fortify Lough Swilly and Lough Foyle against French Invasion during the Revolutionary and Napoleonic Wars and was completed between 1812 and 1813. On the other side of the Lough is Fort Dunree. The fort was built on the site of a temporary fortification first built in 1798.
It is triangular in shape with a tower on the landward salient angle. From the tower, the two walls of the fort, protected by a dry moat partly cut into the rock, lead down to the edge of steep rocky cliffs, where there are batteries on two levels. The lower battery with seven gun emplacements, originally mounted French 42 Pounder smooth bore guns on traversing platforms. The upper level contains barrack accommodation, magazine, casemates, entrance gateway and an upper battery for two 24 Pounder smooth bore guns on the northern flank of this level. The tower is quadrant-shaped in plan with corners rounded off and was armed with a 24 Pounder gun and a 5.5-inch howitzer.
After the end of the Napoleonic Wars the defences were neglected and not updated. By the 1860s the Fort was armed with an 18 Pounder gun and 5.5-inch howitzer in the tower. The upper battery had a 24 pounder gun. By this time the Fort was obsolete and was disarmed and abandoned by the military in the 1870s.
The fort remains substantially intact, and is now in use as a private residence.
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.