Swiftness of movement was Caesar's distinguishing excellence. The legions were kept ready to march at an hour's notice. He sent an order to Crassus to join him instantly from Montdidier. He sent to Fabius at St. Pol to meet him at Arras. He wrote to Labienus, telling him the situation, and leaving him to his discretion to advance or to remain on his guard at Lavacherie, as might seem most prudent. Not caring to wait for the rest of his army, and leaving Crassus to take care of Amiens, he started himself, the morning after the information reached him, with Trebonius's legion to Cicero's relief. Fabius joined him, as he had been directed, at Arras. He had hoped for Labienus's presence also; but Labienus sent to say that he was surrounded by the Treveri, and dared not stir. Caesar approved his hesitation, and with but two legions, amounting in all to only 7,000 men, he hurried forward to the Nervian border. Learning that Cicero was still holding out, he wrote a letter to him in Greek, that it might be unintelligible if intercepted, to tell him that help was near. A Gaul carried the letter, and fastened it by a line to his javelin, which he flung over Cicero's rampart. The javelin stuck in the side of one of the towers and was unobserved for several days. The besiegers were better informed. They learnt that Caesar was at hand, that he had but a handful of men with him. By that time their own numbers had risen to 60,000, and, leaving Cicero to be dealt with at leisure, they moved off to envelop and destroy their great enemy. Caesar was well served by spies. He knew that Cicero was no longer in immediate danger, and there was thus no occasion for him to risk a battle at a disadvantage to relieve him. When he found the Gauls near him, he encamped, drawing his lines as narrowly as he could, that from the small show which he made they might imagine his troops to be even fewer than they were. He invited attack by an ostentation of timidity, and having tempted the Gauls to become the assailants, he flung open his gates, rushed out upon them with his whole force, and all but annihilated them. The patriot army was broken to pieces, and the unfortunate Nervii and Aduatuci never rallied from this second blow. Caesar could then go at his leisure to Cicero and his comrades, who had fought so nobly against such desperate odds. In every ten men he found that there was but one unwounded. He inquired with minute curiosity into every detail of the siege. In a general address he thanked Cicero and the whole legion. He thanked the officers man by man for their gallantry and fidelity. Now for the first time (and that he could have remained ignorant of it so long speaks for the passionate unanimity with which the Gauls had risen) he learnt from prisoners the fate of Sabinus. He did not underrate the greatness of the catastrophe. The soldiers in the army he treated always as friends and comrades in arms, and the loss of so many of them was as personally grievous to him