  The Roman Empire stumbled and almost fell in the 0rd century AD, weighed down by civil war, usurpers, invasion, plague and inflation. Rome teetered on the brink of disaster. Legions in Crisis looks at the crippling body blows inflicted on the Roman Empire during this 0rd century trauma.  The Roman Empire stumbled and almost fell in the 0rd century AD, weighed down by civil war, usurpers, invasion, plague and inflation. Rome teetered on the brink of disaster. Legions in Crisis looks at the crippling body blows inflicted on the Roman Empire during this 0rd century trauma. 