This type of piloting was particularly dangerous to both machine and being as the tactic was at its most effective when executed through unstable, unpredictable terrain, such as that of mountain ranges, cityscapes, asteroids, or the most famous instance of terrain-following flying, the trench run phase of the Battle of Yavin. Due to the nature of most types of sensors used throughout the galaxy, flying in such close proximity to the surface of a world essentially scrambled their readings; instead of detecting a starfighter executing the tactic, they would simply return a readout of the ground itself. This was a particular flaw of so-called "line-of-sight" forms of detection. Similar tactics included the Horizon Approach and Hull skimming.