Investment (military)Investment is the military process of surrounding an enemy fort (or town) with armed forces to prevent entry or escape. It serves both to cut communications with the outside world and to prevent supplies and reinforcements from being introduced. A contravallation is a line of fortifications, built by the attackers around the besieged fortification facing towards an enemy fort to protect the besiegers from sorties by its defenders and to enhance the blockade.
Tel LachishLachish (לכיש; Λαχίς; Lachis) was an ancient Canaanite and Israelite city in the Shephelah ("lowlands of Judea") region of Israel, on the south bank of the Lakhish River, mentioned several times in the Hebrew Bible. The current tell (ruin) by that name, known as Tel Lachish (תל לכיש) or Tell ed-Duweir (تل الدوير), has been identified with the biblical Lachish. Today, it is an Israeli national park operated and maintained by the Israel Nature and Parks Authority.
Science and technology of the Song dynastyThe Song dynasty (; 960–1279 CE) invented some technological advances in Chinese history, many of which came from talented statesmen drafted by the government through imperial examinations. The ingenuity of advanced mechanical engineering had a long tradition in China. The Song engineer Su Song admitted that he and his contemporaries were building upon the achievements of the ancients such as Zhang Heng (78–139), an astronomer, inventor, and early master of mechanical gears.
BombardmentA bombardment is an attack by artillery fire or by dropping bombs from aircraft on fortifications, combatants, or towns and buildings. Prior to World War I, the term was only applied to the bombardment of defenseless or undefended objects, houses, public buildings, etc. It was only loosely employed to describe artillery attacks upon forts or fortified positions in preparation for assaults by infantry. Since then, it has come to mean any mass attack delivered by artillery or short-range tactical missiles, and later, aerial bombardment delivered by aircraft or long-range missiles.
SappingSapping is a term used in siege operations to describe the digging of a covered trench (a "sap") to approach a besieged place without danger from the enemy's fire. The purpose of the sap is usually to advance a besieging army's position towards an attacked fortification. It is excavated by specialised military units, whose members are often called sappers. By using the sap, the besiegers could move closer to the walls of a fortress, without exposing the sappers to direct fire from the defending force.
VegetiusPublius (or Flavius) Vegetius Renatus, known as Vegetius (u̯ɛˈɡɛtiʊs), was a writer of the Later Roman Empire (late 4th century). Nothing is known of his life or station beyond what is contained in his two surviving works: Epitoma rei militaris (also referred to as De re militari), and the lesser-known Digesta Artis Mulomedicinae, a guide to veterinary medicine. He identifies himself in the opening of his work Epitoma rei militaris as a Christian.
Siege of PetersburgThe Richmond–Petersburg campaign was a series of battles around Petersburg, Virginia, fought from June 9, 1864, to March 25, 1865, during the American Civil War. Although it is more popularly known as the siege of Petersburg, it was not a classic military siege, in which a city is encircled with fortifications blocking all routes of ingress and egress, nor was it strictly limited to actions against Petersburg. The campaign consisted of nine months of trench warfare in which Union forces commanded by Lt. Gen.
Enfilade and defiladeEnfilade and defilade are concepts in military tactics used to describe a military formation's exposure to enemy fire. A formation or position is "in enfilade" if weapon fire can be directed along its longest axis. A unit or position is "in defilade" if it uses natural or artificial obstacles to shield or conceal itself from enfilade and hostile fire. The strategies, named by the English during the Hundred Years' War, use the French ("to put on a string or sling") and ("to slip away or off") spoken by English nobility of the time.
De re militariDe re militari (Latin "Concerning Military Matters"), also Epitoma rei militaris, is a treatise by the Late Latin writer Publius Flavius Vegetius Renatus about Roman warfare and military principles as a presentation of the methods and practices in use during the height of the Roman Empire and responsible for its power. The extant text dates to the 5th century. Vegetius emphasized things such as training of soldiers as a disciplined force, orderly strategy, maintenance of supply lines and logistics, quality leadership and use of tactics and even deceit to ensure advantage over the opposition.
Field gunA field gun is a field artillery piece. Originally the term referred to smaller guns that could accompany a field army on the march, that when in combat could be moved about the battlefield in response to changing circumstances (field artillery), as opposed to guns installed in a fort (garrison artillery or coastal artillery), or to siege cannons and mortars which are too large to be moved quickly, and would be used only in a prolonged siege.
