Maps are split up into territories. Occupy the most structures in a territory to keep control of it. Territories provide army-wide bonuses and increase the number of troops you can control. Reinforcements arrive via your controlled territories. Map control is the key to victory.
Buildings represent important strategic points; this is primarily an urban war after all. Some buildings unlock abilities, new units, passive bonuses, or squad refreshes. Storm buildings to uproot and destroy entrenched enemy forces. You have full control of your units whether they are inside or outside.
No soldier hits his mark 100% of the time, and no weapon is completely accurate. Distance plays a role. Closing down on your target is dangerous but can yield better results.
The most common cause of death for soldiers of the Laperian conflict is exposure. And bullets. And exposure to bullets. Cover makes your units harder to hit. Troops in cover can be dispatched more easily by flanking and rear attacks. Troop placement and cover management are critical to your success.