C. Julius Caesar, Gallic War

Caesar, approving of his motives, although he was disappointed in his expectation of three legions, and reduced to two, yet placed his only hopes of the common safety in dispatch. He goes into the territories of the Nervii by long marches. There he learns from some prisoners what things are going on in the camp of Cicero, and in how great jeopardy the affair is. Then with great rewards he induces a certain man of the Gallic horse to convey a letter to Cicero. This he sends written in Greek characters, lest the letter being intercepted, our measures should be discovered by the enemy. He directs him, if he should be unable to enter, to throw his spear with the letter fastened to the thong, inside the fortifications of the camp. He writes in the letter, that he having set out with his legions, will quickly be there: he entreats him to maintain his ancient valor. The Gaul apprehending danger, throws his spear as he has been directed. Is by chance stuck in a tower, and, not being observed by our men for two days, was seen by a certain soldier on the third day: when taken down, it was carried to Cicero. He, after perusing it, reads it out in an assembly of the soldiers, and fills all with the greatest joy. Then the smoke of the fires was seen in the distance, a circumstance which banished all doubt of the arrival of the legions.