Ab urbe condita
Titus Livius (Livy)
Livy. History of Rome, Volumes 1-2. Roberts, Canon, Rev, translator. London, New York: J. M. Dent and Sons; E. P. Dutton and Co., 1912.
A very strong body of the enemy were concealed on either side of the road, and when they saw that the Romans had entered the forest they suddenly raised a shout and made a tumultuous attack upon them.
The suddenness of the affair at first created some confusion, while the men were piling their kits in the centre of the column and getting at their weapons, but as soon as they had each freed themselves from their burdens and put themselves in fighting trim, they began to assemble round the standards. From their old discipline and long experience they knew their places in the ranks, and the line was formed without any orders being needed, each man acting on his own initiative.