By struggles such as these the contest between the Romans and the Britons was carried on for many generations; the Romans conquering at every trial, until, at length, the Britons learned to submit without further resistance to their sway. In fact, there gradually came upon the stage, during the progress of these centuries, a new power, acting as an enemy to both the Picts and Scots; hordes of lawless barbarians, who inhabited the mountains and morasses of Scotland and Ireland. These terrible savages made continual irruptions into the southern country for plunder, burning and destroying, as they retired, whatever they could not carry away. They lived in impregnable and almost inaccessible fastnesses, among dark glens and precipitous mountains, and upon gloomy islands surrounded by iron-bound coasts and stormy seas. The Roman legions made repeated attempts to hunt them out of these retreats, but with very little success. At length a line of fortified posts was established across the island, near where the boundary line now lies between England and Scotland; and by guarding this line, the Roman generals who had charge of Britain attempted to protect the inhabitants of the southern country, who had learned at length to submit peaceably to their sway.

One of the most memorable events which occurred during the time that the Romans held possession of the island of Britain was the visit of one of the emperors to this northern extremity of his dominions. The name of this emperor was Severus. He was powerful and prosperous at home, but his life was embittered by one great calamity, the dissolute character and the perpetual quarrels of his sons. To remove them from Rome, where they disgraced both themselves and their father by their vicious lives, and the ferocious rivalry and hatred they bore to each other, Severus planned an excursion to Britain, taking them with him, in the hope of turning their minds into new channels of thought, and awakening in them some new and nobler ambition.

At the time when Severus undertook this expedition, he was advanced in age and very infirm. He suffered much from the gout, so that he was unable to travel by any ordinary conveyance, and was borne, accordingly, almost all the way upon a litter. He crossed the Channel with his army, and, leaving one of his sons in command in the south part of the island, he advanced with the other, at the head of an enormous force, determined to push boldly forward into the heart of Scotland, and to bring the war with the Picts and Scots to an effectual end.

He met, however, with very partial success. His soldiers became entangled in bogs and morasses; they fell into ambuscades; they suffered every degree of privation and hardship for want of water and of food, and were continually entrapped by their enemies in situations where they had to fight in small numbers and at a great disadvantage. Then, too, the aged and feeble general was kept in a continual fever of anxiety and trouble by Bassianus, the son whom he had brought with him to the north. The dissoluteness and violence of his character were not changed by the change of scene. He formed plots and conspiracies against his father's authority; he raised mutinies in the army; he headed riots; and he was finally detected in a plan for actually assassinating his father. Severus, when he discovered this last enormity of wickedness, sent for his son to come to his imperial tent. He laid a naked sword before him, and then, after bitterly reproaching him with his undutiful and ungrateful conduct, he said, "If you wish to kill me, do it now. Here I stand, old, infirm, and helpless. You are young and strong, and can do it easily. I am ready. Strike the blow."

The wall extended across the island, from the mouth of the Tyne, on the German Ocean, to the Solway Frith-nearly seventy miles. It was twelve feet high, and eight feet wide. It was faced with substantial masonry on both sides, the intermediate space being likewise filled in with stone. When it crossed bays or morasses, piles were driven to serve as a foundation. Of course, such a wall as this, by itself, would be no defense. It was to be garrisoned by soldiers, being intended, in fact, only as a means to enable a smaller number of troops than would otherwise be necessary to guard the line. For these soldiers there were built great fortresses at intervals along the wall, wherever a situation was found favorable for such structures. These were called stations. The stations were occupied by garrisons of troops, and small towns of artificers and laborers soon sprung up around them. Between the stations, at smaller intervals, were other smaller fortresses called castles, intended as places of defense, and rallying points in case of an attack, but not for garrisons of any considerable number of men. Then, between the castles, at smaller intervals still, were turrets, used as watch-towers and posts for sentinels. Thus the whole line of the wall was every where defended by armed men. The whole number thus employed in the defense of this extraordinary rampart was said to be ten thousand. There was a broad, deep, and continuous ditch on the northern side of the wall, to make the impediment still greater for the enemy, and a spacious and well-constructed military road on the southern side, on which troops, stores, wagons, and baggage of every kind could be readily transported along the line, from one end to the other.

Wall of Severus

The wall was a good defense as long as Roman soldiers remained to guard it. But in process of time-about two centuries after Severus's day-the Roman empire itself began to decline, even in the very seat and center of its power; and then, to preserve their own capital from destruction, the government were obliged to call their distant armies home. The wall was left to the Britons; but they could not defend it. The Picts and Scots, finding out the change, renewed their assaults. They battered down the castles; they made breaches here and there in the wall; they built vessels, and, passing round by sea across the mouth of the Solway Frith and of the River Tyne, they renewed their old incursions for plunder and destruction. The Britons, in extreme distress, sent again and again to recall the Romans to their aid, and they did, in fact, receive from them some occasional and temporary succor. At length, however, all hope of help from this quarter failed, and the Britons, finding their condition desperate, were compelled to resort to a desperate remedy, the nature of which will be explained in the next chapter.

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