Otho (3.3-3.4)

And so, when the emperor sent Crispinus to bring back the seventeenth legion from Ostia, and while that officer was still getting the baggage together at night and loading the arms upon the waggons, the boldest of the soldiers all began to cry out that Crispinus was come on no good errand, and that the senate was attempting to bring about a revolution, and that the transportation of the arms was an act of hostility, not of service, to the emperor.

The notion prevailed with great numbers and exasperated them; some attacked the waggons, others killed two centurions who opposed them, as well as Crispinus himself; and then the whole body, putting themselves in array and exhorting one another to go to the help of the emperor, marched to Rome. Here, learning that eighty senators were at supper with Otho, they rushed to the palace, declaring that now was a good time to take off all the emperor’s enemies at one stroke.