The authors of this book delved into the history of the Wall that ran from coast to coast, dividing Britain in two. Occasionally the Romans would march north and consider the complete conquest of the island; at other times the northern tribes would spill over the Wall to pillage the Roman province. Despite this, for three hundred years, with very few lapses, the peace of the frontier was regulated by the troops along the Wall. Only when the Western Empire fell did the soldiers drift away and the Wall decayed. In their review of the evidence, the authors include details about the Roman army, its religion and daily bureaucratic life on the Wall.