1. You may want the enemy as far away as possible, because you have mainly Fortifications and Artillery. With this Insight, you can place all his units in Reserve.
2. You may want the enemy as near as possible, maybe because he has Cannons you want to stop firing. With this Insight, and the Insight to place you own units in the Front, you can quickly make contact.
Also works well with sweep strategies, when you need to buy space for the sweep to trigger in a short battle.