Hadrian's Wall

Hadrian, iu A. D. 120, built a stono Wall f rom Bowness, near Carlisle, 011 Solway frith, to tlie river Tyne, near Newcastlc It was 80 miles long and garrisoned by 10,000 troops. It was Erom 12 to 20 feet high at various poiuts, 8 feet thíok at the top and was provided with a gallery in the rear, which enabled its defenders to take their stand with only head and shonlders visible to the enemy. At every quarter of a mile there was a castle with a garrisou of troops. Beacon lights and signáis were used, and on an attack, whether by day or by night, the j news was at once flashed up and down the wall from sea to sea.