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.
The existence of this festival was widely recognised, and it was while the two brothers were engaged in it that the brigands, enraged at losing their plunder, ambushed them. Romulus successfully defended himself, but Remus was taken prisoner and brought before Amulius, his captors impudently accusing him of their own crimes.
The principal charge brought against them was that of invading Numitor's lands with a body of young men whom they had got together, and carrying off plunder as though in regular warfare.