Although the Caledonians had been defeated, they were not subdued, and they continued to fight so fiercely that the Romans gave up trying to keep the forts which Agricola had built.
Later on a Roman Emperor called Hadrian came to Britain, and he built a wall from the Tyne to the Solway. This wall ran straight across the country from sea to sea over hills and valleys, and it was so strong, and so well built, that although hundreds of years have passed since then it may still be seen to this day.
But even this great wall did not keep back the Caledonians. They broke through it or sailed round the ends of it in their little boats made of wickerwork covered with the skins of animals. Some years later another Roman Emperor called Antonine came to Britain. He drove the Caledonians back again beyond Agricola's forts, and there he built a wall which is still called by his name.
But the Caledonians broke through or climbed over this wall too. The first man who leaped over the wall was called Graham, and the ruins of that part of the wall are called Graham's Dyke to this day. Dyke is a Scottish word for wall.
Many years passed. The Romans called Britain a Roman province, but the wild people of the north not only remained unconquered but they became ever more and more bold. They over-leaped the wall more and more often, coming farther and farther south, fighting and plundering as they went.
At last an Emperor called Severus, hearing of the deeds of the wild Caledonians, resolved to conquer them. This Emperor was old and ill. He was so ill that he could not walk, and had to be carried in a kind of bed called a litter. But he was full of courage and determination, and gathering a great army of soldiers he invaded Scotland.
Scotland at this time was covered in many parts with pathless forest, and even where there were roads they were not fit for a great army, such as Severus now brought with him, to pass over.
So Severus as he marched his army through Scotland cut down trees, drained marshes, made roads and built bridges. Slowly but with fierce determination, led by a sick man who was carried about in a bed, the Romans marched through Scotland. From south to north they marched, yet they never fought a battle or came face to face with an enemy.
The Caledonians followed their march, dashing out upon them unawares, swooping down upon and killing those who lagged behind or who strayed too far ahead. In this way many were killed, many too died of cold, hunger, and weariness; still on and on, over hill and valley, swept the mighty host, to the very north of Scotland. There they turned and marched back again, and at last they reached the border and crossed beyond the wall, leaving fifty thousand of their number dead in the hills and valleys of the north.
No wonder that brave old Severus gave up the task as hopeless, and instead of trying to fight any more, he strengthened and repaired the wall which Hadrian had built so many years before.
And so it went on year by year, the Caledonians always attacking, the Romans always trying to drive them back again. At last, nearly five hundred years after they first came to Britain, the Romans went away altogether.
When the Romans had gone, the Caledonians found the south of Britain more easy to attack than ever. For as the Romans took away not only their own soldiers, but the best of the British whom they had trained to fight, there was now no one to guard the walls.
So the Caledonians threw down and destroyed the wall between the Forth and the Clyde. They broke and ruined great parts of Hadrian's wall too, and overran the south of Britain as far as London.
At last the Britons were in such dread and fear of the Caledonians that they sent to their old enemies the Romans for help. But the Romans would not help them. The Britons then sent to the Saxons, and the Saxons came to their aid.
When the King of the Picts heard that the Saxons had come to help the Britons, he sent to the King of the Scots begging him to join in fighting them. So the Picts and the Scots joined together against the Britons and the Saxons. But when the Picts and Scots saw the great army of Britons and the strange fierce Saxon warriors, some of them were afraid and stole away to hide themselves in the woods near. The two kings when they heard of this were very angry. They sent to seek these cowards, brought them back, and hanged them every one in sight of the whole army, so that none might be tempted to follow their example.
Then Dougall the Scottish King and Galanus the Pictish King spoke to their people and encouraged them with brave words.
When the battle began, arrows flew thick and fast, and it seemed as if neither side would give way. But when they came near to each other, the Picts and Scots charged so fiercely that the Britons fled before them. Then a fearful storm arose. The sky grew black with clouds and the air dark with rain and hail, which dashed on friend and foe alike. In the darkness the Picts and the Scots lost their rank and order, and when the storm passed over, the Saxons and the Britons had won the battle.
It was a sorrowful day for the Picts and the Scots. They fled away, leaving the Britons to rejoice over the thousands of their enemies who lay dead upon the field.
But the Britons had no great cause for rejoicing, for the Saxons rid south Britain of the Picts and the Scots only to conquer it for themselves. And soon the Britons were glad to ask the Picts and Scots to help them to drive the Saxons out of their land. This they were never able to do, and the Saxons took all the south of Britain and made it their own. But Scotland they could never conquer.