28. During the same summer, a cohort of Usipii, [107] which had been levied in Germany, and sent over into Britain, performed an extremely daring and memorable action. After murdering a centurion and some soldiers who had been incorporated with them for the purpose of instructing them in military discipline, they seized upon three light vessels, and compelled the masters to go on board with them. One of these, however, escaping to shore, they killed the other two upon suspicion; and before the affair was publicly known, they sailed away, as it were by miracle. They were presently driven at the mercy of the waves; and had frequent conflicts, with various success, with the Britons, defending their property from plunder. [108] At length they were reduced to such extremity of distress as to be obliged to feed upon each other; the weakest being first sacrificed, and then such as were taken by lot. In this manner having sailed round the island, they lost their ships through want of skill; and, being regarded as pirates, were intercepted, first by the Suevi, then by the Frisii. Some of them, after being sold for slaves, by the change of masters were brought to the Roman side of the river, [109] and became notorious from the relation of their extraordinary adventures. [110] 29. In the beginning of the next summer, [111] Agricola received a severe domestic wound in the loss of a son, about a year old. He bore this calamity, not with the ostentatious firmness which many have affected, nor yet with the tears and lamentations of feminine sorrow; and war was one of the remedies of his grief. Having sent forwards his fleet to spread its ravages through various parts of the coast, in order to excite an extensive and dubious alarm, he marched with an army equipped for expedition, to which he had joined the bravest of the Britons whose fidelity had been approved by a long allegiance, and arrived at the Grampian hills, where the enemy was already encamped. [112] For the Britons, undismayed by the event of the former action, expecting revenge or slavery, and at length taught that the common danger was to be repelled by union alone, had assembled the strength of all their tribes by embassies and confederacies. Upwards of thirty thousand men in arms were now descried; and the youth, together with those of a hale and vigorous age, renowned in war, and bearing their several honorary decorations, were still flocking in; when Calgacus, [113] the most distinguished for birth and valor among the chieftans, is said to have harangued the multitude, gathering round, and eager for battle, after the following manner:--