Before 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 personnel.
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.
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