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 336 The military discipline which reigned in the camps of Probus was less cruel than that of Aurelian, but it was equally rigid and exact. The latter had punished the irregularities of the soldiers with unrelenting severity, the former prevented them by employing the legions in constant and useful labours. When Probus commanded in Egypt, he executed many considerable works for the splendour and benefit of that rich country. The navigation of the Nile, so important to Rome itself, was improved; and temples, bridges, porticoes, and palaces, were constructed by the hands of the soldiers, who acted by turns as architects, as engineers, and as husbandmen. It was reported of Hannibal that, in order to preserve his troops from the dangerous temptations of idleness, he had obliged them to form large plantations of olive trees along the coast of Africa. From a similar principle, Probus exercised his legions in covering with rich vineyards the hills of Gaul and Pannonia, and two considerable spots are described, which were entirely dug and planted by military labour. One of these, known under the name of Mount Alma, was situated near Sirmium, the country where Probus was born, for which he ever retained a partial affection, and whose gratitude he endeavoured to secure by converting into tillage a large and unhealthy track of marshy ground. An army thus employed constituted perhaps the most useful, as well as the bravest, portion of the Roman subjects.

But, in the prosecution of a favourite scheme, the best of men, satisfied with the rectitude of their intentions, are subject to forget the bounds of moderation; nor did Probus himself sufficiently consult the patience and disposition of his fierce legionaries. The dangers of the military profession seem only to be compensated by a life of pleasure and idleness; but, if the duties of the soldier are incessantly aggravated by the labours of the peasant, he will at last sink under the intolerable burden, or shake it off with indignation. The imprudence of Probus is said to have inflamed the discontent of his troops. More attentive