Further upstream at Clady is a magnificent bridge with nine arches. Thought to date from the late seventeenth century this crosses the River Finn linking Co Tyrone with Co Donegal. It is marked by the very large pedestrian refuges to either side of the narrow bridge. The structure was constructed at the highest fordable point of the Foyle river system and was the location of a skirmish during the Siege of Derry. The ford was the location of a battle between the O'Neill’s (Cenel Owen) and the O'Donnell’s (Cenel Conaill) in 784. Clady was called Cladyford for many years and its name in Gaelic (Claideach) means the “muddy bank of a sluggish river,