Plane of Site. The general level of the ground or ground line, upon which the works are constructed, is called the plane of site, whether that plane be horizontal or oblique to the horizon.
Plane Table. A surveying instrument, consisting of a table or board and arrangements for leveling and traversing it. It is much used in military surveys and in gunnery in getting the ranges of projectiles by the method of intersections.
Plant, To. In a military sense, to place; to fix; as, to plant a standard. It likewise signifies to arrange different pieces of ordnance for the purpose of doing execution against an enemy or his works; hence, to plant a battery. Some authors apply this word to the act of directing a cannon properly.
Plantagenet. The surname of a dynasty of English kings who ruled from 1154 to 1485. Henry II. was the founder, and Richard III., who was killed at Bosworth, the last of the line. They were generally warlike and ambitious rulers, being engaged in contests at home (see [Roses, Wars of the]) and in France. The name belonged to the house of Anjou, and is said to have been derived from the circumstance of the first count of this house having caused himself to be scourged with branches of broom (planta genista) as a penance for some crime. The name passed to the English line of kings through the extinction of the old Norman dynasty in the male line in the person of Henry II., and the marriage of Matilda, his daughter, to Geoffrey, count of Anjou, their son succeeding to the throne.
Plassey. A village of British India, in the district of Nuddea, presidency of Bengal, on the left bank of the Hooghly, 96 miles north of Calcutta. It is memorable as the scene of the victory that laid the foundation of the British-Indian empire. On June 23, 1757, Clive, with a force of 900 Europeans and 2100 Sepoys, crossed the river to attack 68,000 men under Sooraj-oo-Dowlah, soubahdar of Bengal. After much cannonading on both sides, Meer Jaffier, who was in the interest of the British, advised the soubahdar to retreat. Clive immediately advanced, routed the army, and took the camp of the soubahdar, who was dethroned to make way for the traitor Meer Jaffier.
Plastron (Fr.). Stuffed pad or cushion, formerly worn at the shoulder to sustain the recoil of heavy muskets and other fire-arms, still used by fencers upon the right side; also a breastplate or half cuirass. In the old French service, the gens d’armes, the heavy cavalry, the light horse, etc., were obliged to wear them on all occasions, at reviews, etc.
Platæa (more commonly Platææ). An ancient city of Bœotia, on the northern slope of Mount Cithæron, on the frontiers of Attica. At an early period, the Platæans deserted the Bœotian confederacy, and placed themselves under the protection of Athens; and when the Persians invaded Attica in 490 B.C., they sent 1000 men to the assistance of the Athenians, and had the honor of fighting on their side at the battle of Marathon. Ten years afterwards (480 B.C.) their city was destroyed by the Persian army under Xerxes at the instigation of the Thebans. It was the site of the battle between Mardonius, commander of the army of Xerxes of Persia, and Pausanias, commanding the Lacedæmonians and Athenians, 479 B.C.; the same day as the battle of Mycale. Of 300,000 Persians, scarce 3000 escaped with their lives. The Grecian army, about 110,000, lost but few men. The Greeks obtained immense plunder, and were henceforth delivered from the fear of Persian invasions. In the third year of the Peloponnesian war (429), the Thebans persuaded the Spartans to attack Platæa, and after a siege of two years at length succeeded in obtaining possession of the place (427). Platæa was then razed to the ground, but was again rebuilt after the peace of Antalcidas (387 B.C.). It was destroyed the third time by its inveterate enemies, the Thebans, in 374 B.C. It was rebuilt by Philip II. of Macedon, after his victory at Chæronea, 338 B.C.
Plate. Metallic armor composed of broad pieces, and thus distinguished from mail.
Plate. To arm with plate or metal for defense. “Why plated in habiliments of war?”
Plate-armor. Armor of strong metal plates for protecting fortifications and the like; also mail consisting entirely of metallic plates, formerly worn to protect the person.