Martius hic primum ter vomere fusus ab ipso
clangor et ex omni sonuerunt cornua sulco;
bellatrix tunc gleba quati pariterque creari
armarique phalanx totisque insurgere campis.
(Valerius Flaccus, Arg. 7.610-613)
Then thrice from the very ploughshare issued the trump of Mars and from every furrow blared the horns; then was the warlike soil shaken, and the phalanx took life and arms together, and sprang up all over the plain. (tr. John Henry Mozley)