The strategic aspect comes from:
- The presence of buildings on the battlefield that contribute to the player’s war effort, and that the player will have to capture and hold to increase his chances of winning
- Terrain that can be utilised to significantly boost the power of the units situated on it
The tactical aspect comes from the customary positioning of troops in pursuit of the chosen strategic objective.
To win, a player will need to have a sound grasp of the strategic possibilities on the battlefield (to know what importance to attach to different parts of it), and will need to be thoroughly familiar with the units at his disposal (to know which ones to train and assign to what tasks).
For this model to work, it will be necessary to keep individual combat turns simple and quick, so that the player can plan several turns ahead and not lose sight of the long-term picture. Numerous or elaborate combat rules and unit abilities are likely to be counterproductive.
As far as I’m aware, the game with the most similar combat model to this one is the mobile game Ancient Empires II: