Suddenly the German cavalry arrive; their march had been concealed by the woods. Without halting, they rush toward the Decuman gate, and attempt to enter the camp. (_See Plate 18._) The attack is so sudden, that the merchants established under the _vallum_ have not time to enter. The soldiers, taken by surprise, are in confusion; the cohort on guard struggles to prevent the enemy from entering the gate. The Sicambri spread themselves round the camp, to discover another passage; but, fortunately, the nature of the locality and the retrenchments render access impossible everywhere but at the gates. They attempt to force an entry there, and are prevented with difficulty. The alarm and disorder are at their height. The soldiers are uncertain where to direct their steps, or where to assemble; some pretend that the camp is taken, others that the army and Cæsar have perished. A feeling of superstitious anxiety recalls to their minds the disaster of Sabinus and Cotta, slain at the same place. At the sight of such a general consternation, the barbarians are confirmed in their opinion that the Romans are too few to resist; they strive to force an entrance, and urge one another not to let so rich a prey escape. Among the sick left in the camp was the primipilus P. Sextius Baculus, who had signalised himself in the preceding combats. For five days he had taken no food. Uneasy for the safety of all, as well as his own, he leaves his tent without arms, sees before him the enemy and the danger, snatches a sword from the first man he meets, and takes his post at a gate. The centurions of the cohort on guard follow him, and all together sustain the attack for a few instants. Baculus, grievously wounded, faints. He is passed from hand to hand, and only saved with difficulty. This incident gives the others time to recover their courage. They remain on the rampart, and present at least some appearance of defence. At this moment the soldiers who had gone out to reap were on their way back to the camp; they are struck with the cries they hear; the cavalry press forward, perceive the imminence of the danger, and see, with terror, that it is no longer possible to obtain refuge behind the retrenchments. The newly-levied soldiers, inexperienced in war, interrogate the tribune and centurions with their looks, and wait their orders. There is no one so brave as not to be agitated by so unexpected an event. The Sicambri, perceiving the ensigns at a distance, believe at first that the legions were returning, and cease from the attack; but soon, filled with contempt for such a handful of men, they rush upon them on all sides.