A small military museum that's been on my list for a many years, but I never got round to visiting. Greys Point Fort. Think Guns of Navarone, but overlooking the entrance to Belfast Lough. Built in 1904, its supposed to be the first place to fire in anger for Britain in WWII. Two days after Britain declared war on Germany, a merchant ship from Liverpool, sailed into Belfast, completely unaware of the two six inch guns. Greys Point tried to contact the ship, to no avail, so they fired a warning shot across the bows. That was the only time the guns fired in anger in their entire history.
The site fell into dereliction. but was resurrected by volunteers in recent years

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