The conspirators now found that it was useless any longer to attempt to conceal their plans. In fact, they were already all exposed, and they knew that William would immediately summon his troops and come out to seize them. They must, therefore, either fly from the country or attempt an open rebellion. They decided on the latter--the result was a civil war. In the end, William was victorious. He took a large number of the rebels prisoners, and he adopted the following very singular plan for inflicting a suitable punishment upon them, and at the same time erecting a permanent monument of his victory. He laid out a public road across the country, on the line over which he had been conducted by the sons of Hubert, and compelled the rebels to make it. A great part of this country was low and marshy, and had been for this reason avoided by the public road, which took a circuitous course around it. The rebel prisoners were now, however, set at work to raise a terrace or embankment, on a line surveyed by William's engineers, which followed almost exactly the course of his retreat. The high road was then laid out upon this terrace, and it became immediately a public thoroughfare of great importance. It continued for several centuries one of the most frequented highways in the realm, and was known by the name of the Raised Road--_Terre levée_--throughout the kingdom. In fact, the remains of it, appearing like the ruins of an ancient rail-road embankment, exist to the present day.
In the course of the war with these rebels a curious incident occurred at one of the battles, or, rather, is said to have occurred, by the historians who tell the story, which, if true, illustrates very strikingly the romantic and chivalrous ideas of the times. Just as the battle was commencing, William perceived a strong and finely-equipped body of horsemen preparing to charge upon the very spot where he himself, surrounded by his officers, was standing. Now the armor worn by knights in battle in those times covered and concealed the figure and the face so fully, that it would have been impossible even for acquaintances and friends to recognize each other, were it not that the knights were all accustomed to wear certain devices upon some part of their armor--painted, for instance, upon their shields, or embroidered on little banners which they bore--by means of which they might be known. These devices became at length hereditary in the great families--sons being proud to wear, themselves, the emblems to which the deeds of their fathers had imparted a trace of glory and renown. The devices of different chieftains were combined, sometimes, in cases of intermarriage, or were modified in various ways; and with these minor changes they would descend from generation to generation as the family coat of arms. And this was the origin of heraldry.