What level of warfare involves the application of operational art linking strategy and tactics through campaigns and operations?

The level of warfare that involves the application of operational art, which connects strategy and tactics through campaigns and operations, is the operational level. This level focuses on the planning and execution of campaigns that lead to desired outcomes over a broader timeline, incorporating both short-term and long-term objectives. It serves as the bridge between the tactical level, which deals with individual engagements and battles, and the strategic level, which encompasses national goals and alliances.

Operational art allows military leaders to create a coherent campaign that integrates various tactical actions into a unified effort, thereby ensuring that all components work towards achieving the overarching strategic objectives. This level deals with the alignment of resources, capabilities, and timelines to ensure success in large-scale military operations.