The military heritage of Northumberland is without doubt one of the richest in all the British Isles. By nature of it being England's most northern county, its borders have seen many bloody clashes and battles since the earliest times. Hadrian's Wall stretches along the south of the county and is dotted with forts, garrisons and fortified settlements along its length. The first Viking raid was carried out upon Lindisfarne in 793. There were clashes...