Numerous examples could be cited of almost incredible disorder in the armies, originating generally in the misconduct of the imperial government. Belisarius attempted, but found it impossible, to enforce strict discipline,[12] when the soldiers were unpaid and the officers authorised to act independently of his orders. Two thousand Heruli ventured to quit his standard in Italy, and, after marching round the Adriatic, were pardoned by Justinian and again engaged in the imperial service. Procopius mentions repeatedly that the conduct of the unpaid and unpunished troops ruined the provinces; and in Africa, no less than three Roman officers, Stozas, Maximin, and Gontharis, attempted to render themselves independent, and were supported by large bodies of troops. The Greeks were the only portion of the population who were considered as sincerely attached to the imperial government, or at least who would readily defend it against every enemy; and accordingly Gontharis, when he wished to secure Carthage, ordered all the Greeks to be murdered without distinction. The Greeks were, however, from their position and rank in society as burgesses or taxpayers, almost entirely excluded from the army, and though they furnished the greater part of the sailors for the fleet, they were generally an unwarlike population. Witiges, the Gothic king, calls the Roman army of Belisarius an army of Greeks, a band of pirates, actors, and mountebanks. One of the most unfortunate measures of Justinian was the disbanding all the provincial militia. This is incidentally mentioned in the _Secret History_ of Procopius, who informs us that Thermopylæ had been previously guarded by two thousand of this militia; but that this corps was dissolved, and a garrison of regular troops placed in Greece. As a general measure it was probably dictated by a plan of financial reform, and not by any fear of popular insurrection; but its effects were extremely injurious to the empire in the declining state of society, and in the increasing disorganisation of the central power; and though it may possibly have prevented some provinces from recovering their independence by their own arms, it prepared the way for the easy conquests of the Avars and Arabs. Justinian was desirous of centralising all power, and rendering all public burdens uniform and systematic; and had adopted the opinion that it was cheaper to defend the empire by walls and fortresses than by a movable army. The practice of moving the troops with great celerity to defend the frontiers had induced the officers to abandon the ancient practice of fortifying a regular camp; and at last even the art of encamping was neglected. The barbarians, however, could always move with greater rapidity than the regular troops of the empire.