What are the best defined as the employment and ordered arrangement of forces?

The employment and ordered arrangement of forces refers to how military forces are organized and utilized in specific situations to achieve combat objectives. Tactics specifically focus on the techniques and methods employed on the battlefield to achieve these goals. This can involve the immediate planning and execution of specific maneuvers in combat situations. Tactics are concerned with the details of how forces are deployed, including formations and direct engagements with the enemy, making them crucial for successful operations.

Conversely, operations encompass a broader scope, typically involving larger campaigns and the coordination of different tactics across various battles. Strategies deal with long-term planning and the overarching goals of military engagement, while logistics focuses on the supply chain and the management of resources necessary for sustaining military forces. Thus, in terms of defining the employment and ordered arrangement of forces, tactics is the most appropriate choice.