Pioneers. Are soldiers sometimes detailed from the different companies of a regiment and formed under a non-commissioned officer, furnished with saws, felling axes, spades, mattocks, pickaxes, and bill-hooks. Their services are very important, and no regiment is well fitted for service without pioneers completely equipped. In European armies there are a certain number of pioneers to each regiment.

Pipe of Peace. See [Calumet].

Pipe-clay. A composition which soldiers use for the purpose of keeping their buff cross-belts, etc., clean.

Piquichins (Fr.). Irregular and ill-armed soldiers, of which mention is made in the history of the reign of Philip Augustus. They were attached to the infantry.

Piquier (Fr.). A pikeman, or one who is armed with a pike.

Pirmasens, or Pirmasenz. A town of Rhenish Bavaria. Here Moreau and the French were defeated by the Duke of Brunswick and the Prussians, September 14, 1793.

Pirogue. American Indian canoe, dug out, formed out of the trunk of a tree; or two canoes united. A term also applied in the United States to a narrow ferry-boat carrying two masts and a leeboard.

Pisa (anc. Pisæ). One of the oldest and most beautiful cities of Italy, and, till lately, the capital of the now extinct grand duchy of Tuscany, on the banks of the river Arno. Pisæ was one of the twelve cities of Etruria; it is frequently mentioned in the Ligurian wars as the headquarters of the Roman legions. Early in the 11th century, Pisa had risen to the rank of a powerful republic. Its troops took part in all the great events of the Holy Land; and its fleet in turn gave aid to the pope in Southern Italy, to the emperor in Northern France, chastised the Moors, and exacted its own terms from the Eastern emperors. In their wars with the Saracens of Sardinia, the Pisans had conquered Sardinia, Corsica, and the Balearic Islands, and for a time maintained their ground against their hereditary enemies, the Genoese; but having sided with the Ghibellines in the long wars which desolated the empire, Pisa suffered severely at the hands of the victorious Guelphic party. Indeed, the rivalry of the Guelphic cities of Florence, Lucca, and Siena nearly brought Pisa to the brink of ruin at the close of the 13th century; and after struggling for more than a hundred years against external foes and the internal dissensions between the democratic mob and the Ghibelline nobles, without losing their character for indomitable valor, the Pisans finally threw themselves under the protection of Galeazzo Visconti of Milan. It became subject to Florence after a long siege, 1405-6. In 1494, Pisa became independent under the protection of Charles VIII. of France. When the French left Italy, the old struggle was renewed; and after offering a desperate resistance, the Pisans, in 1509, were compelled by hunger to surrender the city to the Florentine army besieging the walls.

Pisidia. A district of Asia Minor, originally included within Pamphylia, or Phrygia, was constituted a separate province in the division of the Roman empire under Constantine the Great. It was bounded north and west by Phrygia and Lycia, and south by Pamphylia, and east by Cilicia and Isauria. The inhabitants were a lawless and freebooting people, spurning the advance of civilization, and daring any invader to follow them into their rugged fastnesses. Rome conquered them only to find that their spirit of independence was not broken. They would not brook the establishment of a single garrison or colony. It was only their towns that paid tribute. They carried their invincible dispositions down to modern times; and under the appellation of Karamanians they still continue to be wild, rapacious, and suspicious of strangers.

Pistol. Is the smallest description of fire-arm, and is intended to be used with one hand only. Pistols were first used by the cavalry of England about 1544. They vary in size from the delicate saloon-pistol, often not 6 inches long, to the horse-pistol, which may measure 18 inches, and sometimes even 2 feet. They are carried in holsters at the saddle-bow, in the belt, or in the pocket. Every cavalry soldier should have pistols, for a fire-arm is often of great service for personal defense, and almost indispensable in giving an alarm or signal. Of late years pistols have been made with revolving cylinder breeches, in which are formed several chambers for receiving cartridges, and bringing them in succession into a line with the barrel ready for firing. See [Revolvers].