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Military tactics (Greek: Taktikē, the art of organizing an army) are the techniques for using weapons or military units in combination for engaging and defeating an enemy in battle. Changes in philosophy and technology over time have been reflected in changes to military tactics.
Up until the nineteenth century, many military tactics were confined to battlefield concerns, such as how to best maneuver units during combat in open terrain. In current military thought, tactics are the lowest level of planning, involving small units ranging from a few dozen to a few hundred men. Units are organized into formations, comprising a higher level of planning known as the operational use of forces. The third tier of military planning is strategic, which is concerned with the overall means and plan for achieving a long-term outcome. Operational warfare is thus an intermediate level in which the aim is to convert the strategy (highest level) into tactics (lowest level of planning).
Specialized tactics exist for many situations, ranging from securing a room or individual building, to large-scale operations such as establishing air superiority over a region. Today, military tactics are employed at all levels of command, from individual and group up to entire armed forces. Indeed, the units used in warfare have always been a reflection of current military tactics, and their size and composition have varied accordingly.
The United States Army Field Manual 3-0 offers the following definition of tactics: "Tactics – (Department Of Defense) 1. The employment of units in combat. 2. The ordered arrangement and maneuver of units in relation to each other and/or to the enemy in order to use their full potentialities. (Army) The employment of units in combat. It includes the ordered arrangement and maneuver of units in relation to each other, the terrain, and the enemy in order to translate potential combat power into victorious battles and engagements. (FM 3-0)."
The US military generally defines three levels of war; 1. the strategic, which includes both the National level and the Combat Command (theatre) level; 2. the operational level, which extends from the level of a joint task force including the combined forces of naval and air power with amphibious and ground operation to the maneuver brigade echelon; and 3. the tactical echelon that extends from the maneuver brigade to the lowest fighting elements including individual soldiers.
Most people, including some people who are otherwise well-acquainted with military vocabulary, incorrectly use the words "strategy" and "tactics" more or less interchangably.
Military tactics are at once both a science and an art; there are basic principles which -- if followed -- at least lend competency, 'battle drills' which try to promote automatic responses to given situations, and dozens of guides and instructions have been written over the centuries. For some, tactics are instinctive; sometimes they can be taught; at its heart, tactics is a shifting amalgalm of psychology, physics, and statistics.
Some practices have not changed since the dawn of warfare: Ambushes, seeking and turning flanks, maintaining reconnaissance, creating and using obstacles and defences, ad infinitum. Using ground to best advantage has not changed much either; heights, rivers and swamps, passes and choke points, natural cover, all of these can be used in multiple ways.
What does change constantly is the technological dimension, as well as the sociology of combatants. One might wish to reflect on the differences in the technology and society that produced such different types of soldier or warrior as the Roman Legionnary, Mongol Horse Archer, the Chinese Crossbowman, the British Redcoat, or an Air Cavalry trooper. Each, constrained by his weaponry, logistics and his social conditioning, would use a battlefield differently but would -- usually -- seek the same outcomes from their use of tactics.