Such was the important battle of Mantineia, fought in the month of June 418 B.C. Its effect throughout Greece was prodigious. The numbers engaged on both sides were very considerable for a Grecian army of that day, though seemingly not so large as at the battle of Delium five years before: the number and grandeur of the states whose troops were engaged was, however, greater than at Delium. But what gave peculiar value to the battle was, that it wiped off at once the preëxisting stain upon the honor of Sparta. The disaster in Sphakteria, disappointing all previous expectation, had drawn upon her the imputation of something like cowardice; and there were other proceedings which, with far better reason, caused her to be stigmatized as stupid and backward. But the victory of Mantineia silenced all such disparaging criticism, and replaced Sparta in her old position of military preëminence before the eyes of Greece. It worked so much the more powerfully because it was entirely the fruit of Lacedæmonian courage, with little aid from that peculiar skill and tactics, which was generally seen concomitant, but had in the present case been found comparatively wanting. The manœuvre of Agis, in itself not ill-conceived, for the purpose of extending his left wing, had failed through the disobedience of the two refractory polemarchs: but in such a case the shame of failure falls more or less upon all parties concerned; nor could either general or soldiers be considered to have displayed at Mantineia any of that professional aptitude which caused the Lacedæmonians to be styled “artists in warlike affairs.” So much the more conspicuously did Lacedæmonian courage stand out to view. After the left wing had been broken, and when the Argeian Thousand had penetrated into the vacant space between the left and centre, so that they might have taken the centre in flank, and ought to have done so, had they been well advised, the troops in the centre, instead of being daunted as most Grecian soldiers would have been, had marched forward against the enemies in their front, and gained a complete victory. The consequences of the battle were thus immense in reëstablishing the reputation of the Lacedæmonians, and in exalting them again to their ancient dignity of chiefs of Peloponnesus.[126]
We are not surprised to hear that the two polemarchs, Aristoklês and Hipponoidas, whose disobedience had wellnigh caused the ruin of the army, were tried and condemned to banishment as cowards, on their return to Sparta.[127]
Looking at the battle from the point of view of the other side, we may remark, that the defeat was greatly occasioned by the selfish caprice of the Eleians in withdrawing their three thousand men immediately before the battle, because the other allies, instead of marching against Lepreum, preferred to attempt the far more important town of Tegea: an additional illustration of the remark of Periklês at the beginning of the war, that numerous and equal allies could never be kept in harmonious coöperation.[128] Shortly after the defeat, the three thousand Eleians came back to the aid of Mantineia,—probably regretting their previous untoward departure,—together with a reinforcement of one thousand Athenians. Moreover, the Karneian month began, a season which the Lacedæmonians kept rigidly holy; even despatching messengers to countermand their extra-Peloponnesian allies, whom they had invoked prior to the late battle,[129] and remaining themselves within their own territory, so that the field was for the moment left clear for the operations of a defeated enemy. Accordingly, the Epidaurians, though they had made an inroad into the territory of Argos during the absence of the Argeian main force at the time of the late battle, and had gained a partial success, now found their own territory overrun by the united Eleians, Mantineians, and Athenians, who were bold enough even to commence a wall of circumvallation round the town of Epidaurus itself. The entire work was distributed between them to be accomplished; but the superior activity and perseverance of the Athenians was here displayed in a conspicuous manner. For while the portion of work committed to them—the fortification of the cape on which the Heræum or temple of Hêrê was situated—was indefatigably prosecuted and speedily brought to completion, their allies, both Eleians and Mantineians, abandoned the tasks respectively allotted to them in impatience and disgust. The idea of circumvallation being for this reason relinquished, a joint garrison was left in the new fort at Cape Heræum, after which the allies evacuated the Epidaurian territory.[130]
So far, the Lacedæmonians appeared to have derived little positive benefit from their late victory: but the fruits of it were soon manifested in the very centre of their enemy’s force, at Argos. A material change had taken place since the battle in the political tendencies of that city. There had been within it always an opposition party, philo-Laconian and anti-democratical: and the effect of the defeat of Mantineia had been to strengthen this party as much as it depressed their opponents. The democratical leaders, who, in conjunction with Athens and Alkibiades, had aspired to maintain an ascendency in Peloponnesus hostile and equal, if not superior to Sparta, now found their calculations overthrown and exchanged for the discouraging necessities of self-defence against a victorious enemy. And while these leaders thus lost general influence by so complete a defeat of their foreign policy, the ordinary democratical soldiers of Argos brought back with them from the field of Mantineia, nothing but humiliation and terror of the Lacedæmonian arms. But the chosen Argeian Thousand-regiment returned with very different feelings. Victorious over the left wing of their enemies, they had not been seriously obstructed in their retreat even by the Lacedæmonian centre. They had thus reaped positive glory,[131] and doubtless felt contempt for their beaten fellow-citizens. Now it has been already mentioned that these Thousand were men of rich families, and the best military age, set apart by the Argeian democracy to receive permanent training at the public expense, just at a time when the ambitious views of Argos first began to dawn, after the Peace of Nikias. So long as Argos was likely to become or continue the imperial state of Peloponnesus, these Thousand wealthy men would probably find their dignity sufficiently consulted in upholding her as such, and would thus acquiesce in the democratical government. But when the defeat of Mantineia reduced Argos to her own limits, and threw her upon the defensive, there was nothing to counterbalance their natural oligarchical sentiments, so that they became decided opponents of the democratical government in its distress. The oligarchical party in Argos, thus encouraged and reinforced, entered into a conspiracy with the Lacedæmonians to bring the city into alliance with Sparta as well as to overthrow the democracy.[132]
As the first step towards the execution of this scheme, the Lacedæmonians, about the end of September, marched out their full forces as far as Tegea, thus threatening invasion, and inspiring terror at Argos. From Tegea they sent forward as envoy Lichas, proxenus of the Argeians at Sparta, with two alternative propositions: one for peace, which he was instructed to tender and prevail upon the Argeians to accept, if he could; another, in case they refused, of a menacing character. It was the scheme of the oligarchical faction first to bring the city into alliance with Lacedæmon and dissolve the connection with Athens, before they attempted any innovation in the government. The arrival of Lichas was the signal for them to manifest themselves by strenuously pressing the acceptance of his pacific proposition. But they had to contend against a strong resistance; since Alkibiadês, still in Argos, employed his utmost energy to defeat their views. Nothing but the presence of the Lacedæmonian army at Tegea, and the general despondency of the people, at length enabled them to carry their point, and to procure acceptance of the proposed treaty; which being already adopted by the ekklesia at Sparta, was sent ready prepared to Argos, and there sanctioned without alteration. The conditions were substantially as follows:—
“The Argeians shall restore the boys whom they have received as hostages from Orchomenus, and the men-hostages from the Mænalii. They shall restore to the Lacedæmonians the men now in Mantineia, whom the Lacedæmonians had placed as hostages for safe custody in Orchomenus, and whom the Argeians and Mantineians have carried away from that place. They shall evacuate Epidaurus, and raze the fort recently erected near it. The Athenians, unless they also forthwith evacuate Epidaurus, shall be proclaimed as enemies to Lacedæmon as well as to Argos, and to the allies of both. The Lacedæmonians shall restore all the hostages whom they now have in keeping, from whatever place they may have been taken. Respecting the sacrifice alleged to be due to Apollo by the Epidaurians, the Argeians will consent to tender to them an oath, which if they swear, they shall clear themselves.[133] Every city in Peloponnesus, small or great, shall be autonomous and at liberty to maintain its own ancient constitution. If any extra-Peloponnesian city shall come against Peloponnesus with mischievous projects, Lacedæmon and Argos will take joint counsel against it, in the manner most equitable for the interest of the Peloponnesians generally. The extra-Peloponnesian allies of Sparta shall be in the same position with reference to this treaty as the allies of Lacedæmon and Argos in Peloponnesus, and shall hold their own in the same manner. The Argeians shall show this treaty to their allies, who shall be admitted to subscribe to it, if they think fit. But if the allies desire anything different, the Argeians shall send them home about their business.”[134]
Such was the agreement sent ready prepared by the Lacedæmonians to Argos, and there literally accepted. It presented a reciprocity little more than nominal, imposing one obligation of no importance upon Sparta; though it answered the purpose of the latter by substantially dissolving the alliance of Argos with its three confederates.
But this treaty was meant by the oligarchical party in Argos only as preface to a series of ulterior measures. As soon as it was concluded, the menacing army of Sparta was withdrawn from Tegea, and was exchanged for free and peaceful intercommunication between the Lacedæmonians and Argeians. Probably Alkibiadês at the same time retired, while the renewed visits and hospitalities of Lacedæmonians at Argos strengthened the interest of their party more than ever. They were soon powerful enough to persuade the Argeian assembly formally to renounce the alliance with Athens, Elis, and Mantineia, and to conclude a special alliance with Sparta, on the following terms:—
“There shall be peace and alliance for fifty years between the Lacedæmonians and the Argeians—upon equal terms—each giving amicable satisfaction, according to its established constitution, to all complaints preferred by the other. On the same condition, also, the other Peloponnesian cities shall partake in this peace and alliance, holding their own territory, laws, and separate constitution. All extra-Peloponnesian allies of Sparta shall be put upon the same footing as the Lacedæmonians themselves. The allies of Argos shall also be put upon the same footing as Argos herself, holding their own territory undisturbed. Should occasion arise for common military operations on any point, the Lacedæmonians and Argeians shall take counsel together, determining in the most equitable manner they can for the interest of their allies. If any one of the cities hereunto belonging, either in or out of Peloponnesus, shall have disputes either about boundaries or other topics, she shall be held bound to enter upon amicable adjustment.[135] If any allied city shall quarrel with another allied city, the matter shall be referred to some third city satisfactory to both. Each city shall render justice to her own citizens according to her own ancient constitution.”
It will be observed that in this treaty of alliance, the disputed question of headship is compromised or evaded. Lacedæmon and Argos are both put upon an equal footing, in respect to taking joint counsel for the general body of allies: they two alone are to decide, without consulting the other allies, though binding themselves to have regard to the interests of the latter. The policy of Lacedæmon also pervades the treaty, that of insuring autonomy to all the lesser states of Peloponnesus, and thus breaking up the empire of Elis, Mantineia, or any other larger state which might have dependencies.[136] And accordingly the Mantineians, finding themselves abandoned by Argos, were constrained to make their submission to Sparta, enrolling themselves again as her allies, renouncing all command over their Arcadian subjects, and delivering up the hostages of these latter, according to the stipulation in the treaty between Lacedæmon and Argos.[137] The Lacedæmonians do not seem to have meddled farther with Elis. Being already possessed of Lepreum,—through the Brasideian settlers planted there,—they perhaps did not wish again to provoke the Eleians, from fear of being excluded a second time from the Olympic festival.