be ill, in order not to have to fight against his friend Catiline. [343] A _legatus_, in this sense (for it also means 'ambassador'), supplied, in a Roman army, the place of a commander possessing the _imperium_. Accordingly, consuls and praetors, when intrusted with the command of an army, had one or more legates, according to the number of legions which they had under their command. The office of legate was given by the senate to such men as had held a magistracy, generally the praetorship, or at least the quaestorship, and the senate appointed them on the proposal of the commander-in-chief. When there were several legates, the commander-in-chief might intrust one of them with the command of the whole army; but the commander-in-chief was answerable for all the acts of his legate. [344] _Tumulti_ for _tumultus_, as _senati_ for _senatus_. 60. Sed ubi, omnibus rebus exploratis, Petreius tuba signum dat, cohortes paulatim incedere jubet, idem facit hostium exercitus. Postquam eo ventum est, unde a ferentariis[345] proelium committi posset, maximo clamore cum infestis signis[346] concurrunt; pila omittunt, gladiis res geritur. Veterani, pristinae virtutis memores, comminus acriter instare; illi haud timidi resistunt; maxima vi certatur. Interea Catilina cum expeditis in prima acie versari, laborantibus succurrere; integros pro sauciis accersere, omnia providere, multum ipse pugnare saepe, hostem ferire; strenui militis et boni imperatoris officia simul exequebatur. Petreius, ubi videt Catilinam, contra ac ratus erat, magna vi tendere, cohortem praetoriam[347] in medios hostes inducit, eosque perturbatos atque alios alibi resistentes interficit; deinde utrimque ex lateribus ceteros aggreditur. Manlius et Faesulanus in primis pugnantes cadunt. Postquam fusas copias seque cum paucis relictum videt Catilina, memor generis atque pristinae suae dignitatis, in confertissimos hostes incurrit ibique pugnans confoditur. [345] _Ferentarii_ are light-armed troops fighting at a distance with javelins. [346] The banners being turned hostilely against one another. Respecting _cum_, see Zumpt, S 473; for we also find _infestis signis concurrere_, without _cum_, as an ablative of the instrument. [347] The _cohors praetoria_ was a battalion which, in forming an army, was composed of the ablest and most tried soldiers, as the bodyguard of the commander-in-chief. They had to protect him, and assist him in contriving to bring any engagement to the point where he wished it to be. Under the emperors, the _cohortes praetoriae_, nine or ten in number--the emperors having several armies under their command--formed the body-guard of the emperor and the garrison of Rome.