Chasseurs are French regiments, designed chiefly to act as scouts and skirmishers. The chasseurs d'Afrique are cavalry which have been trained in Algeria, and have become exceedingly expert through conflicts with the Arabs. The spahis are Arab cavalry, in the French service, and are such admirable riders that they will charge over all kinds of ground, and dash upon a foe who judges himself secure amid rocks or trees or ditches.
At the commencement of the war the rebel cavalry was superior to that furnished by the North. For this there were many reasons. Southern plantation life had accustomed the aristocratic youth to the saddle, and great attention was bestowed on the training of horses. At the North the number of skilled riders was comparatively few. Gradually, however, Northern energy, endurance, and patient discipline began to tell, and the time soon arrived when the Southern cavalry were invariably driven, especially in sabre charges, to which Southerners have great aversion. At present, on account of the scarcity of horses, the difficulty of supplying forage, and the loss of so many gay youths of the chivalry, the Southern, cavalry has dwindled into such a condition as to be no longer formidable.
The service of the cavalry in both armies during the war has been exclusively as light cavalry—scouting, picketing, raiding, etc. Its combats have been with forces of its own arm. No commander has yet succeeded in assisting to determine the issue of a pitched battle by the charges of his mounted troops. Our cavalry have rendered, however, brilliant and invaluable services in protecting the rear and flanks of the armies, and by their magnificent raiding expeditions into the enemy's country, destroying his supplies, injuring his communications, diverting his forces, and liberating his slaves. No sufficient accounts of such expeditions and of the numerous cavalry conflicts have been published; yet they are very desirable. They would furnish most interesting narratives, and be a valuable contribution not only to the history of the times, but to the history of warfare; for the operations of the cavalry in this war constitute a new era in the history of this branch of military service. Unless care is exercised to procure such narratives, our posterity will never know anything of many battle fields where fought and fell brave troopers from every Northern State.
The chief duties of officers belonging to the corps of engineers, when connected with an army acting in the field, are the supervision of routes of communication, the laying of bridges, the selection of positions for fortifications, and the indication of the proper character of works to be constructed. Should a siege occur, a new and very important class of duties devolves on them, relating to the trenches, saps, batteries, etc.
Not only is there in Virginia a lack of good roads, but the numerous streams have few or no bridges. In many cases where bridges have existed, one or the other of the contending armies has destroyed them to impede the march of its opponents. Streams which have an average depth of three or four feet are, however, generally without bridges, except where crossed by some turnpike, the common country roads mostly leading to fords. The famous Bull Run is an example. There were but two or three bridges over this stream in the space of country penetrated by the roads generally pursued by our army in advancing or retreating, and these have been several times destroyed and rebuilt. The stream varies from two to six feet in depth—the fords being at places of favorable depth, and where the bottom is gravelly and the banks sloping. Often such streams as this, and indeed smaller ones, become immensely swelled in volume by storms, so that a comparatively insignificant rivulet might greatly delay the march of an army, if means for quickly crossing should not be provided. The general depth of a ford which a large force, with its appurtenances, can safely cross, is about three feet, and even then the bottom should be good and the current gentle. With a greater depth of water, the men are likely to wet their cartridge boxes, or be swept off their feet. There is a small stream about three miles from Alexandria, crossing the Little River turnpike, which has never been bridged, and which was once so suddenly swollen by rain that all the artillery and wagons of a corps were obliged to wait about twelve hours for its subsidence. The mules of some wagons driven into it were swept away. Fords, unless of the best bottom, are rendered impassable after a small portion of the wagons and artillery of an army have crossed them—the gravel being cut through into the underlying clay, and the banks converted into sloughs by the dripping of water from the animals and wheels.
A very amusing scene was presented at the crossing of Hazel River (a branch of the Rappahannock) last fall, when the Army of the Potomac first marched to Culpepper. The stream was at least three feet deep, and at various places four—the current very rapid—the bottom filled with large stones, and the banks steep, except where a narrow road had been cut for the wagons. The men adopted various expedients for crossing. Some went in boldly all accoutred; some took off shoes and stockings, and carefully rolled up their trousers; others (and they were the wisest) divested themselves of all their lower clothing. The long column struggled as best it could through the water, and occasionally, amid vociferous shouts, those who had been careful to roll up their trousers would step into a hole up to the middle; others, who had taken still more precautions, would stumble over a stone and pitch headlong into the roaring waters, dropping their guns, and splashing vainly about with their heavy knapsacks, in the endeavor to regain a footing, until some of their comrades righted them; and others, after getting over safely, would slip back from the sandy bank, and take an involuntary immersion. Some clung to the rear of the wagons, but in the middle of the stream the mules would become fractious, or the wagon would get jammed against a stone, and the unfortunate passengers were compelled to drop off and wade ashore, greeted by roars of derisive laughter. On such occasions soldiers give full play to their humor. They accept the hardships with good nature, and make the best of any ridiculous incident that may happen. At the time referred to, many conscripts had just joined the ranks, and cries resounded everywhere among the old soldiers: 'Hello, conscripts, how do you like this?' 'What d'ye think of sogering now?' 'This is nothing. You'll have to go in up to yer neck next time.'
Generally, when the exigencies of the march will permit, bridges are made over such streams, either by the engineers of the army, or detachments from the various corps which are passing upon the roads. They are simple 'corduroy bridges,' and can be laid very expeditiously. Two or three piers of stones and logs are placed in the stream, string pieces are stretched upon them, and cross pieces of small round logs laid down for the flooring. The most extensive bridges of this kind used by the Army of the Potomac were those over the Chickahominy in the Peninsular campaign. 'Sumner's bridge,' by which reinforcements crossed at the battle of Fair Oaks, was laid in this manner. Of course such bridges are liable to be carried away and to be easily destroyed. Some of the bridges over the Chickahominy were laid much more thoroughly. 'Cribs' of logs were piled in cob-house fashion, pinned together, and sunk vertically in the stream. Then string pieces and the flooring were laid, the whole covered with brush and dirt. Men worked at these bridges up to the waist in water for many days in succession.
Military art has devised many expedients for bridging streams, and use is made of any facilities that may be at hand for constructing the means of passage; but the only organized bridge trains which move with the army are those which carry the pontoons. Of these there are various kinds, made of wood, of corrugated iron, and of india rubber stretched over frames. But the wooden pontoon boats are most in use. They can be placed in a river and the flooring laid upon them with great rapidity. Several very fine bridges have been thus constructed—among them may be mentioned the one at the mouth of the Chickahominy, across which General McClellan's army marched in retreating from Harrison's Landing. It was about a mile long, and was constructed in a few hours.
To cross a river under the fire of an enemy is one of the most difficult operations in warfare. Yet it has been frequently accomplished by our armies. The crossing of the Rappahannock by General Burnside's army, previous to the great battle of Fredericksburg, in December, 1862, is one of the most remarkable instances of the kind during the war. The rebel rifle pits lined the southern bank, and the fire from them prevented our engineers from approaching—the river being only about seventy-five yards wide. For a long time our artillery failed to drive the rebels away. About noon of the day on which the crossing was made, General Burnside ordered a concentration of fire on Fredericksburg, in the houses of which place the rebels had concealed their forces. A hundred guns, hurling shot and shell into every building and street of the city, soon riddled it; but the obstinate foes hid themselves in the cellars till the storm was over, and then emerged defiantly. They were only dislodged by sending over a battalion in boats to attack them in flank, when they retreated, and the bridges were laid.
It is impossible to explain in articles of this character the mysteries of intrenchment and fortification, so that they will be comprehensible. A few notes, however, on some of the principal terms constantly employed, may be found useful and interesting.