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tactic, learn u how to overwhelm minefields. shell fire is a constant overhead. the drone unit use daylight to help direct artillery fire. >> so they're using this to correct the next shell that's fired. >> reporter: and know they must keep hidden. >> there's still the basic problem that it's trench warfare and minefields. that by definition makes the going slow. as the sky darkens and the air cools here, an advantage has emerged. one of their drones is equipped with a thermal camera. they've noticed out in the wide cratered fields where the