Which war level involves the actual employment and ordered arrangement of forces in battle?

The level of war that involves the actual employment and ordered arrangement of forces in battle is tactical war. This level focuses on the execution of battles and engagements, where military units interact directly in combat. Tactics are concerned with how forces are deployed, maneuvered, and conducted in a specific engagement to achieve immediate objectives.

Tactical decisions include the planning and coordination of individual units during combat operations, such as the positioning of troops, the use of cover and concealment, and the timing of attacks. This level is crucial for determining the outcome of individual battles, which can collectively influence broader operational and strategic objectives.

In the context of warfare, tactical considerations are foundational; they are where the strategic intentions and operational plans materialize into real actions on the battlefield. Successful tactics can lead to victories in key battles, which can then have significant implications at the operational and strategic levels.