On the northeastern coast of Lough (lake) Neagh, Antrim town is located in the Six Mile Water valley. In 1798, the town was the scene of a battle in which British forces defeated tens of thousands of nationalists (mostly Presbyterian) led by United Irishmen rebel Henry Joy McCracken. Just north, one of the finest examples of Irish round (watch) towers, dating from the 10th century, stands 93 feet (28 metres) tall and 17 feet (5 metres) in a circle. Antrim Castle, built in the 17th century, is a reminder of the town’s historical strategic importance. Antrim, a lively market town and important road junction, was formerly a significant linen manufacturing centre.