3 | 1864 | - 1864: A man-powered submarine, "Hunley", sank a Federal steam ship, USS Housatonic, at the entrance to Charleston harbour in 1864 – the first recorded successful attack by a submarine on a surface ship
- 11 Mar 1864: The Great Sheffield Flood – over 250 died when a new dam broke while it was being filled for the first time
- 20 Aug 1864: Red Cross established – Twelve nations sign the First Geneva Convention
- 8 Dec 1864: Clifton Suspension Bridge over the River Avon officially opened
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