The soldiers who are bound to obey their officer only once a week or once a month, and who are at all other times at liberty to manage their own affairs their own way, without being in any respect accountable to him, can never be under the same awe in his presence, can never have the same disposition to ready obedience, with those whose whole life and conduct are every day directed by him, and who every day even rise and go to bed, or at least retire to their quarters, according to his orders. In what is called discipline, or in the habit of ready obedience, a militia must always be still more inferior to a standing army than it may sometimes be in what is called the manual exercise, or in the management and use of its arms. But in modern war the habit of ready and instant obedience is of much greater consequence than a considerable superiority in the management of arms.

Those militias which, like the Tartar or Arab militia, go to war under the same chieftains whom they are accustomed to obey in peace are by far the best. In respect for their officers, in the habit of ready obedience, they approach nearest to standing armies. The highland militia, when it served under its own chieftains, had some advantage of the same kind. As the highlanders, however, were not wandering, but stationary shepherds, as they had all a fixed habitation, and were not, in peaceable times, accustomed to follow their chieftain from place to place, so in time of war they were less willing to follow him to any considerable distance, or to continue for any long time in the field. When they had acquired any booty they were eager to return home, and his authority was seldom sufficient to detain them. In point of obedience they were always much inferior to what is reported of the Tartars and Arabs. As the highlanders too, from their stationary life, spend less of their time in the open air, they were always less accustomed to military exercises, and were less expert in the use of their arms than the Tartars and Arabs are said to be.

A militia of any kind, it must be observed, however, which has served for several successive campaigns in the field, becomes in every respect a standing army. The soldiers are every day exercised in the use of their arms, and, being constantly under the command of their officers, are habituated to the same prompt obedience which takes place in standing armies. What they were before they took the field is of little importance. They necessarily become in every respect a standing army after they have passed a few campaigns in it. Should the war in America drag out through another campaign, the American militia may become in every respect a match for that standing army of which the valour appeared, in the last war, at least not inferior to that of the hardiest veterans of France and Spain.

This distinction being well understood, the history of all ages, it will be found, bears testimony to the irresistible superiority which a well-regulated standing army has over a militia.

One of the first standing armies of which we have any distinct account, in any well authenticated history, is that of Philip of Macedon. His frequent wars with the Thracians, Illyrians, Thessalians, and some of the Greek cities in the neighbourhood of Macedon, gradually formed his troops, which in the beginning were probably militia, to the exact discipline of a standing army. When he was at peace, which he was very seldom, and never for any long time together, he was careful not to disband that army. It vanquished and subdued, after a long and violent struggle, indeed, the gallant and well exercised militias of the principal republics of ancient Greece, and afterwards, with very little struggle, the effeminate and ill-exercised militia of the great Persian empire. The fall of the Greek republics and of the Persian empire was the effect of the irresistible superiority which a standing army has over every sort of militia. It is the first great revolution in the affairs of mankind of which history has preserved any distinct or circumstantial account.

The fall of Carthage, and the consequent elevation of Rome, is the second. All the varieties in the fortune of those two famous republics may very well be accounted for from the same cause.

From the end of the first to the beginning of the second Carthaginian war the armies of Carthage were continually in the field, and employed under three great generals, who succeeded one another in the command: Hamilcar, his son-in-law Hasdrubal, and his son Hannibal; first in chastising their own rebellious slaves, afterwards in subduing the revolted nations of Africa, and, lastly, in conquering the great kingdom of Spain. The army which Hannibal led from Spain into Italy must necessarily, in those different wars, have been gradually formed to the exact discipline of a standing army. The Romans, in the meantime, though they had not been altogether at peace, yet they had not, during this period, been engaged in any war of very great consequence, and their military discipline, it is generally said, was a good deal relaxed. The Roman armies which Hannibal encountered at Trebia, Thrasymenus, and Cannae were militia opposed to a standing army. This circumstance, it is probable, contributed more than any other to determine the fate of those battles.

The standing army which Hannibal left behind him in Spain had the like superiority over the militia which the Romans sent to oppose it, and in a few years, under the command of his brother, the younger Hasdrubal, expelled them almost entirely from that country.

Hannibal was ill supplied from home. The Roman militia, being continually in the field, became in the progress of the war a well disciplined and well-exercised standing army, and the superiority of Hannibal grew every day less and less. Hasdrubal judged it necessary to lead the whole, or almost the whole of the standing army which he commanded in Spain, to the assistance of his brother in Italy. In this march he is said to have been misled by his guides, and in a country which he did not know, was surprised and attacked by another standing army, in every respect equal or superior to his own, and was entirely defeated.

When Hasdrubal had left Spain, the great Scipio found nothing to oppose him but a militia inferior to his own. He conquered and subdued that militia, and, in the course of the war, his own militia necessarily became a well-disciplined and well-exercised standing army. That standing army was afterwards carried to Africa, where it found nothing but a militia to oppose it. In order to defend Carthage it became necessary to recall the standing army of Hannibal. The disheartened and frequently defeated African militia joined it, and, at the battle of Zama, composed the greater part of the troops of Hannibal. The event of that day determined the fate of the two rival republics.

From the end of the second Carthaginian war till the fall of the Roman republic, the armies of Rome were in every respect standing armies. The standing army of Macedon made some resistance to their arms. In the height of their grandeur it cost them two great wars, and three great battles, to subdue that little kingdom, of which the conquest would probably have been still more difficult had it not been for the cowardice of its last king. The militias of all the civilised nations of the ancient world, of Greece, of Syria, and of Egypt, made but a feeble resistance to the standing armies of Rome. The militias of some barbarous nations defended themselves much better. The Scythian or Tartar militia, which Mithridates drew from the countries north of the Euxine and Caspian seas, were the most formidable enemies whom the Romans had to encounter after the second Carthaginian war. The Parthian and German militias, too, were always respectable, and upon several occasions gained very considerable advantages over the Roman armies. In general, however, and when the Roman armies were well commanded, they appear to have been very much superior; and if the Romans did not pursue the final conquest either of Parthia or Germany, it was probably because they judged that it was not worth while to add those two barbarous countries to an empire which was already too large. The ancient Parthians appear to have been a nation of Scythian or Tartar extraction, and to have always retained a good deal of the manners of their ancestors. The ancient Germans were, like the Scythians or Tartars, a nation of wandering shepherds, who went to war under the same chiefs whom they were accustomed to follow in peace. Their militia was exactly of the same kind with that of the Scythians or Tartars, from whom, too, they were probably descended.

Many different causes contributed to relax the discipline of the Roman armies. Its extreme severity was, perhaps, one of those causes. In the days of their grandeur, when no enemy appeared capable of opposing them, their heavy armour was laid aside as unnecessarily burdensome, their labourious exercises were neglected as unnecessarily toilsome. Under the Roman emperors, besides, the standing armies of Rome, those particularly which guarded the German and Pannonian frontiers, became dangerous to their masters, against whom they used frequently to set up their own generals. In order to render them less formidable, according to some authors, Dioclesian, according to others, Constantine, first withdrew them from the frontier, where they had always before been encamped in great bodies, generally of two or three legions each, and dispersed them in small bodies through the different provincial towns, from whence they were scarce ever removed but when it became necessary to repel an invasion. Small bodies of soldiers quartered, in trading and manufacturing towns, and seldom removed from those quarters, became themselves tradesmen, artificers, and manufacturers. The civil came to predominate over the military character, and the standing armies of Rome gradually degenerated into a corrupt, neglected, and undisciplined militia, incapable of resisting the attack of the German and Scythian militias, which soon afterwards invaded the western empire. It was only by hiring the militia of some of those nations to oppose to that of others that the emperors were for some time able to defend themselves. The fall of the western empire is the third great revolution in the affairs of mankind of which ancient history has preserved any distinct or circumstantial account. It was brought about by the irresistible superiority which the militia of a barbarous has over that of a civilised nation; which the militia of a nation of shepherds has over that of a nation of husbandmen, artificers, and manufacturers. The victories which have been gained by militias have generally been, not over standing armies, but over other militias in exercise and discipline inferior to themselves. Such were the victories which the Greek militia gained over that of the Persian empire; and such too were those which in later times the Swiss militia gained over that of the Austrians and Burgundians.

The military force of the German and Scythian nations who established themselves upon the ruins of the western empire continued for some time to be of the same kind in their new settlements as it had been in their original country. It was a militia of shepherds and husbandmen, which, in time of war, took the field under the command of the same chieftains whom it was accustomed to obey in peace. It was, therefore, tolerably well exercised, and tolerably well disciplined. As arts and industry advanced, however, the authority of the chieftains gradually decayed, and the great body of the people had less time to spare for military exercises. Both the discipline and the exercise of the feudal militia, therefore, went gradually to ruin, and standing armies were gradually introduced to supply the place of it. When the expedient of a standing army, besides, had once been adopted by one civilised nation, it became necessary that all its neighbours should follow their example. They soon found that their safety depended upon their doing so, and that their own militia was altogether incapable of resisting the attack of such an army.

The soldiers of a standing army, though they may never have seen an enemy, yet have frequently appeared to possess all the courage of veteran troops and the very moment that they took the field to have been fit to face the hardiest and most experienced veterans. In 1756, when the Russian army marched into Poland, the valour of the Russian soldiers did not appear inferior to that of the Prussians, at that time supposed to be the hardiest and most experienced veterans in Europe. The Russian empire, however, had enjoyed a profound peace for near twenty years before, and could at that time have very few soldiers who had ever seen an enemy. When the Spanish war broke out in 1739, England had enjoyed a profound peace for about eight-and-twenty years. The valour of her soldiers, however, far from being corrupted by that long peace, was never more distinguished than in the attempt upon Carthagena, the first unfortunate exploit of that unfortunate war. In a long peace the generals, perhaps, may sometimes forget their skill; but, where a well-regulated standing army has been kept up, the soldiers seem never to forget their valour.