These old roads are of capital importance in the story of England, and though historians have always recognised this there are a number of features about them which have not been sufficiently noted--as, for instance, that armies until perhaps the twelfth century perpetually used them; for the great English roads, though their general track was laid out in pre-historic times, were generally hardened, straightened, and embanked by the Romans in a manner which permitted them to survive right on into the early Middle Ages; and of these four all were so hardened and strengthened, except the Icknield Way. Not one of them is quite complete to-day, but the Ermine Street is perhaps the best preserved. It is a good modern road all the way from Bayden to Gloucester, with the exception of a very slight gap at this village of Cricklade. It originally crossed the river half-a-mile below Cricklade Bridge, so that the priory which stood on the left bank lay just to the south of the old road. How and when the old bridge at Cricklade fell we have no record, but one of the most important records of the Thames in Anglo-Saxon history is connected with this passage of the river. The importance of Cricklade as a station upon the upper Thames does not only proceed from its being the crossing place of a great road, it is also the point when the first important tributary stream, the Churn, joins the Thames. Above this junction the Thames nowadays is hardly a stream; and even in the eighteenth century and earlier, before the digging of the Severn and Thames Canal, it must have depended on the weather whether there were any appreciable amount of water in the upper part or not. It would probably be found, if records could be examined, that the mills at Somerford Keynes were not continually worked throughout the year, even when the supply of water had been left undiminished by modern engineering. But when once the Churn (which, as we have seen, has a larger volume of water than the Thames) had fallen in at Cricklade the two formed a true river, with depth in it always sufficient to support a boat, and with a fairly strong stream, as also with a width sufficient for minor traffic; and it is after Cricklade that you get a succession of villages and churches dependent upon the river and standing close to its banks. But though this piece of hydrography has its importance the chief meaning of Cricklade in history lay in the fact that it was the spot where this Ermine Street on its way from the south country to the Severn Valley got over the Thames, and the village connected with it was entrenched certainly in Roman and probably in pre-Roman times. This entrenchment may still be traced. The crossing of the Thames by the Icknield Way, unlike the crossing of the Ermine Street at Cricklade, presents a problem.