Distant expeditions, immaterial whether in cold or warm countries, with extremes of temperature, are always disadvantageous and must cause great sacrifice of life, not only on account of the untried influence of extreme temperatures on individuals born in other climates, but also on account of the fatigues inseparable from traversing long distances, of an irregular life, of a multiplicity of events and circumstances impossible to foresee, or which at least had not been foreseen, and which operate very unfavorably, morally and physically, on military persons. The expedition of the French army into Russia offers a sad proof of this truth, but history has recorded similar experiences. The army of Alexander the Great suffered frightfully from cold on two occasions: first, when that ambitious conqueror involved himself amid snows, in savage and barbarous regions of northern Asia before reaching the Caucasus; the second time, when, after having crossed these mountains, he passed the Tanais to subdue the Scythians, and the soldiers were oppressed with thirst, hunger, fatigue, and despair, so that a great number died on the road, or lost their feet from congelation; the cold seizing them, it benumbed their hands, and they fell at full length on the snow to rise no more. The best means they knew, says Q. Curtius, to escape that mortal numbness, was not to stop, but to force themselves to keep marching, or else to light great fires at intervals. Charles XII, a great warrior alike rash and unreflecting, in 1707 penetrated into Russia and persisted in his determination of marching to Moscow despite the wise advice given him to retire into Poland. The winter was so severe and the cold so intense that the Swedes and Russians could scarcely hold their arms. He saw part of his army perish before his eyes, of cold, hunger, and misery, amid the desert and icy steppes of the Ukraine. If he had reached Moscow, it is probable that the Russians would have set him at bay, and that his army, forced to retire, would have experienced the same fate as the French.

In the retreat of Prague in 1742 the French army, commanded by Marshal Belle-Isle, little accustomed to a winter campaign, was forced to traverse impracticable defiles across mountains and ravines covered with snow. In ten days 4 thousand men perished of cold and misery; food and clothing were deficient, the soldiers died in anguish and despair, and a great many of the officers and soldiers had their noses, feet and hands frozen. The Russians regard the winter of 1812 as one of the most rigorous of which they have any record; it was intensely felt through all Russia, even in the most southerly parts. As a proof of this fact the Tartars of the Crimea mentioned to Beaupré the behavior of the great and little bustard, which annually at that season of the year quit the plain for protection against the cold and migrate to the southern part of that peninsula toward the coasts. But during that winter they were benumbed by the cold and dropped on the snow, so that a great many of them were caught. In the low hills, in the spring of 1813, the ground in some places was covered with the remains of those birds entire.

Of the effects of cold in general Beaupré says that soldiers who are rarely provided with certain articles of dress suitable for winter, whose caps do not entirely protect the lateral and superior parts of the head, and who often suffer from cold in bivouacs, are very liable to have ears and fingers seized on by asphyxia and mortification. Troopers who remain several days without taking off their boots, and whose usual posture on horseback contributes to benumb the extremities, often have their toes and feet frozen without suspecting it.

Cold produces fatal effects above as well as below the freezing point. A continued moderate cold has the same consequences as a severe cold of short duration. When very intense, as in the north, it sometimes acts on the organism so briskly as to depress and destroy its powers with astonishing rapidity. As the action of cold is most frequently slow and death does not take place until after several hours’ exposure, the contraction that diminishes the caliber of the vessels more and more deeply, repels the blood toward the cavities of the head, chest, and abdomen; it causes, in the circulation of the lungs, and in that of the venous system of the head, an embarrassment that disturbs the function of the brain and concurs to produce somnolence. The probability of this explanation is strengthened by the flowing of the blood from the nose to the ears, spontaneous haemoptysis, also by preternatural redness of the viscera, engorgements of the cerebral vessel, and bloody effusion, all of which conditions have been found after death.

It is certain that in spite of every possible means of congestion or effusion within the cranium, constant and forced motion is necessary for the foot soldier to save him from surprise. The horseman must dismount as quickly as possible and constrain himself to walk. Commanders of divisions should not order halts in winter, and they should take care that the men do not lag behind on the march. Necessary above all are gaiety, courage, and perseverance of the mind; these qualities are the surest means of escaping danger. He who has the misfortune of being alone, inevitably perishes.

In Siberia, the Russian soldiers, to protect themselves from the action of the cold, cover their noses and ears with greased paper. Fatty matters seem to have the power of protecting from cold, or at least of greatly diminishing its action. The Laplander and the Samoiede anoint their skin with rancid fish oil, and thus expose themselves in the mountains to a temperature of -36 deg. Reaumur, or 50 deg. below zero Fahrenheit. Xenophon, during the retreat of the 10 thousand, ordered all his soldiers to grease those parts that were exposed to the air. If this remedy could have been employed, says Beaupré, on the retreat from Moscow, it is probable that it would have prevented more than one accident.

Most of those who escaped the danger of the cold ultimately fell sick. In 1813 a number of soldiers, more or less seriously injured by cold, filled the hospitals of Poland, Prussia, and other parts of Germany. From the shores of the Niemen to the banks of the Rhine it was easy to recognize those persons who constituted the remainder of an army immolated by cold and misery the most appalling. Many, not yet arrived at the limit of their sufferings, distributed themselves in the hospitals on this side of the Rhine, and even as far as the south of France, where they came to undergo various extirpations, incisions, and amputations, necessitated by the physical disorder so often inseparable from profound gangraene.

Mutilation of hands and feet, loss of the nose, of an ear, weakness of sight, deafness, complete or incomplete, neuralgy, rheumatism, palsies, chronic diarrhoea, pectoral affections, recall still more strongly the horrors of this campaign to those who bear such painful mementos.

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But now let us return to the dissertation of von Scherer which gives the most graphic and complete description of the effect of cold.