Distinctly justifiable, if at least Grotius, the father of our international law, is of any authority. The reasoning of Grotius runs in this wise. There is a distinction between conventional signs that are established by the general consent of all the world and those which are only established by particular societies or by individuals; deception directed against the former involves the violation of a mutual obligation, and is therefore unlawful, whereas that against the latter is lawful, because it involves no such violation. Therefore, whilst it is wrong to deceive an enemy by words or signs which by general consent are universally understood in a given sense, it is not wrong to overcome an enemy by conduct which involves no violation of a generally recognised and universally binding custom. Under conduct of the latter type fall such acts as a simulated flight, or the use of an enemy’s arms, his standards, uniform, or sails. A flight is not an instituted sign of fear, nor have the arms or colours of a particular country any universally established meaning.[165] And in spite of the sound of sophistry that accompanies this reasoning, the teaching of international law has not substantially swerved on this point from the direction given to it by Grotius. In Cicero’s opinion, although both force and fraud were resources most unworthy of rational humanity, the one pertaining rather to the nature of the lion and the other to that of the fox, fraud was an expedient deserving of more hatred than the other.[166] But the teaching of later times has tended to overlook this distinction. Bynkershoek, that celebrated Dutch jurist who advocated the use of poison as one of the fair modes of employing force, declares it to be a matter of perfect indifference whether stratagem or open force be employed against an enemy, provided perfidy be absent from the former. And Bluntschli, who is the German publicist of greatest authority in our own day, expressly includes among the lawful stratagems of war the use of an enemy’s uniform or flag.[167] If, then, we test the received military theory by some actual experience, the following episodes of history must challenge rather our admiration than our blame, and stand justified by the most advanced theories of modern international law. Cimon, the Athenian admiral, having captured some Persian ships, made his own men step into them and dress themselves in the clothes of the Persians; and then, when the ships reached Cyprus, and the inhabitants of that island came out joyfully to welcome their friends, they were of course more easily defeated by their enemies.[168] Aristomachus, having taken some Cardian ships, placed his own rowers in them and towed his own ships behind them, as if they were being conducted in triumph. When the Cardians came out to greet their supposed victorious crews, Aristomachus and his men fell upon them and succeeded in committing great carnage.[169]