Yes, I have. Picture the Mongol horde sweeping across the steppe, the ground turning to ice after a winter storm. Their horsemen could charge across frozen rivers, leaving the enemy floundering in muddy trenches. Even Roman legions marched through frozen lakes during campaigns in Britain, using the slick surface to slip past ambushes. The ice becomes a silent ally, a surface that turns treacherous for those who don’t expect it. In modern ski‑run design we think of the same things: the slope’s grip, the temperature of the snow, the angle of descent. It’s a reminder that even in ancient times, commanders read the world’s textures as if they were maps of possibility.