Having crossed the former in the beginning of the sixth summer to explore the harbours on the coast of Fife, he appears to have had his army conveyed across the Bodotria, or Firth of Forth, into the rough peninsula of Fife on the north side of it, and to have gradually, but thoroughly, acquired possession of the country between the Firths of Forth and Tay, while his fleet encircled the coast of Fife, and penetrated into the latter estuary. The appearance of the Roman fleet in the Firth of Tay, making their way, as it were, into the recesses of the country, naturally caused great alarm among the natives; and in order to compel Agricola to abandon his attack on this quarter, they took up arms and assailed the forts which had been placed by him in the country west of the Tay in the third year of his campaigns. That this movement was well devised appears from the proposal of many in Agricola’s army to abandon the country they had just subdued, and fall back upon the line of forts between the Firths of Forth and Clyde. Agricola was at this time probably near the entrance of the river Tay into its estuary, and the large temporary camp on the east bank of the Tay opposite Perth, termed Grassy Walls, may have been his position. Instead of adopting this course, he resolved, trusting to the security of the forts against any attack, to meet the manœuvre of the natives by prosecuting his attack upon the country extending from the east coast north of the Tay to the range of the so-called Grampians; and in order to prevent his army from being surrounded in a difficult country by overwhelming numbers, he marched forward in three divisions. His course, judging from the view his biographer Tacitus gives of his tactics, must have been nearly in a parallel line with the river Tay—his march being on the east side of it, and the enemy rapidly returning from the west to oppose him. The position of the army in its forward march in three divisions is very apparent in the remains of the Roman camps in this district of the country. There is a group of three in a situation remarkably applicable to his design and his position. The camp at Cupar-Angus, which is farthest to the north of the three, probably contained the main division of the army. Within little more than two miles to the south-east is the camp at Lintrose, termed Campmuir, to cover the country to the east; and as the enemy, he immediately apprehended, were not in that quarter, in it he placed the ninth legion, which was the weakest. At an equal distance on the south-west, and overlooking the river Tay, was another camp, of which a strong post still remains, and which obviously guarded the passage of the river.