#warfare
- Boarding — An attack executed at sea by forcing a vessel alongside an enemy ship and securing it to allow the crew to board and capture it through hand-to-hand combat; a mechanical collision, whether intentional or accidental, between two moving vessels on a navigable waterway; (figurative, modern sense) a sudden, direct, or bold approach toward a person in order to secure a favor, information, or an immediate interaction.
- Activilar — A rare historical term denoting a type of light spear, javelin, or short lance used by auxiliary troops or hunters during antiquity and the early Middle Ages. This structural military device was designed to provide maximum mobility and rapid penetration at close ranges.
- Adamsite — A toxic synthetic chemical substance belonging to the organic arsenical class, historically used as a riot control agent or irritating sneeze gas during World War I. Scientifically known as phenarsazine chloride, this crystalline compound causes severe respiratory tract irritation, violent sneezing, nausea, and headaches upon inhalation, currently classified as a chemical weapon banned by international treaties.
- Agathocles — Tyrant and later King of Syracuse (317–289 BC), a prominent and controversial figure of the Hellenistic era, renowned for his military ambitions and ruthless political tactics. Born into a modest potter's family, he rose to power through military force, waging protracted wars against Carthage and becoming the first leader to carry the conflict directly into African territory to relieve the siege on Sicily.
- Agesilaus — A historical proper name of Greek origin; it designates notably Agesilaus II, famous king of Sparta from the Eurypontid dynasty (reigned c. 399–360 BC), recognized for his military genius in Asia Minor campaigns and the Corinthian War, being a central figure described by historians like Xenophon and Plutarch.
- Aisne — A geographical proper noun of Gallo-Roman origin designating an important river in northern France (a tributary of the Oise), as well as the homonymous French department located in the Hauts-de-France region, with its capital at Laon. In universal military history, the Aisne river valley is recognized as a strategic and bloody theater of operations during World War I, including the battles of 1914, 1917 (the Nivelle Offensive), and 1918, events that structurally marked the transition to trench warfare on the Western Front.
- Alala — The Greek mythological personification of the war cry, structurally considered a minor deity (daimon), daughter of Polemos (war) and constant companion of the god Ares on the battlefield; by archaic and culturological extension, the term designates the powerful, rhythmic, and terrifying onomatopoeic cry uttered in chorus by ancient Greek soldiers (Athenians or Spartans) at the moment of the charge, meant to phonically saturate the space and cause psychological panic within the enemy ranks.
- Alalah — Alternative spelling form or exclamatory variant for the term 'alala', designating the ritual battle cry or its personification in ancient Greek tradition; a warlike onomatopoeia structurally used to phonetically simulate the impact and mobilization of troops at the moment of attack. As a minor mythological entity, it represents the terrifying echo of armies marching toward enemy lines under the patronage of the god Ares.
- Ambush — A military tactic or combat method consisting of positioning troops in a hidden and advantageous location, with the purpose of launching a surprise attack on an enemy in transit. In a broad and figurative sense, the term designates a trap, an unexpected snare, or a difficult situation premeditatedly organized to put a person in a vulnerable or disadvantageous position.
- Ambushing — The act of ambushing and its result; the tactical process of covertly positioning military units or attack elements in strategic locations with the purpose of organizing an ambush and surprising the enemy. In a figurative sense, the term can describe the act of catching someone in a social, legal, or economic trap, or the tendency to withdraw or evade major responsibilities.
- Admiral — The highest military rank in the navy, equivalent to the rank of general in the land army; a naval officer who holds this rank and is authorized to command a fleet or a large naval unit. In an historical sense, the term designated the supreme commander of all maritime forces of a state.
- Andartes — A member of the Greek nationalist guerrillas who fought in Macedonia at the beginning of the 20th century against Bulgarian armed bands and Ottoman authorities; a fighter in the Greek resistance during World War II. The term structurally defines a Hellenic insurgent or partisan driven by patriotic ideals in Balkan conflicts.
- Crossbowman — A foot or mounted soldier in medieval armies armed with a crossbow, specialized in long-range target shooting and tactical self-defense behind large shields (pavises). In the 14th and 15th centuries, crossbowmen units (such as the Genoese) formed elite mercenary corps highly sought after by European monarchs for their efficiency in sieges.
- Arcar — An old, rare, or regional variant of the word 'arcaș' (archer); a foot or mounted soldier armed with a bow and arrows, widely utilized in medieval armies for long-range enemy harassment. In historical documents or epoch chronicles, the term also designates the craftsman specialized in manufacturing battle bows or their structural components.
- Archer — A person who shoots with a bow at a target; a soldier from an ancient or medieval army armed with a bow and arrows. In the contemporary era, the term defines an athlete who practices archery within official competitions.
- Female archer — A woman armed with a bow and arrows or specialized in target shooting; a female warrior from the tactical corps of ancient armies or medieval guerrilla detachments. In a modern context, the term designates a registered female athlete who practices competitive archery, demonstrating remarkable structural discipline and geometric precision in national and international competitions.
- Bowmaker — A medieval soldier armed with a bow and arrows; a long-distance fighter who belonged to the military corps of Moldavian or Wallachian rulers. In an extended sense, it denotes the master craftsman or artisan specialized in making battle or hunting bows, a guild renowned for technical secrets regarding flexible wood and animal tendons.
- Arquebus — An individual, portable, long-barreled firearm with a matchlock mechanism, invented in the 15th century, representing one of the first firearms widely used in European infantry. Structurally, it was heavy, muzzle-loaded, and possessed a powerful recoil, often requiring a forked rest support during firing.
- Arquebusier — A soldier from the 15th-17th century infantry armed with an arquebus; a warrior specialized in operating early firearms and executing organized volley fire tactics. These soldiers revolutionized the medieval battlefield, gradually reducing the importance of heavy cavalry and forcing changes in fortification architecture.
- Archer — An old phonetic variant or archaic form for the word 'arcaș' (archer); a foot soldier or horseman armed with a bow and arrows, utilized in the Middle Ages as a tactical ranged unit to harass the enemy or defend fortifications. In a structural-military context, the arciar was part of the elite corps of princely armies, heavily trained to achieve a rapid rate of fire and superior aiming precision.