But this advance precipitated the battle that was imminent, for the Britons, who held the opposite ridge in force, rushed down the slope to the waterside, and furiously attacked the Roman horse. Exhausted though they were by a waterless night march, the Roman cavalry met the assault, and, repelling it, drove the enemy back into the woods. This cavalry charge was followed by a general advance into the dense thickets, into which, excellently suited, both by nature and by art, for defence, the Britons had retired. Here they fought in small bands, protected by mounds and trenches and by felled trees cunningly interlaced. One of these _oppida_ remains in Bourne Park, on the summit of Bridge Hill and beside the Watling Street which, until 1829, was identical with the Dover Road. In that year a slight deviation was made to the left over the hilltop for about two hundred yards' length of roadway, and in the course of cutting through the hill a number of Roman urns and skulls were discovered at a depth of five feet. The circular earthwork of the redoubt still remains in very good preservation, surrounded with trees, the successors of those which covered the hill when the Britons and Romans contended together here. The place is known locally as "Old England's Hole," and tradition has it that here the Britons made their last stand. Tradition is not lightly to be put aside at any time, but when it is supported by Caesar's own words it deserves all respect. "Being repulsed," he writes, "they withdrew themselves into the woods, and reached a place which they had prepared before, having closed all approaches to it by felled timber." The soldiers of the Seventh Legion, however, soon captured this stronghold. Throwing up a mound against it, they advanced, holding their shields over their heads in the formation known as "the tortoise," and drove out the defenders at the sword's point. This was the last place to hold out that day. Everywhere the Britons were dislodged, and numbers of them slain. The survivors withdrew further into the woodlands that surrounded Caer Caint, and Caesar, suspecting ambuscades in those unknown forests, forbade pursuit. [Sidenote: BATTLE OF BARHAM DOWNS] It was evening before the last fighting was done. The battle had raged on a front extending for three miles, from Bekesbourne to Kingston, and it now remained to camp for the night, and to fortify against a possible surprise the ridge which Caesar held. And so, before the exhausted soldiery could lie down to rest after the incessant labours of two days and nights, they threw up the lines of entrenchments that still, after a lapse of more than nineteen hundred years, remain distinct upon Barham Downs.