Source: Warhammer Armies Project: Unofficial 9th Edition

Martial Prowess
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The High Elves possess a natural skill that far outstrips what ordinary mortals possess. When combined with decades of martial training, it creates a warrior elite the likes of which few can comprehend. Discipline and precision are the hallmarks of the High Elf warhost and every soldier knows his place, and can trust those around him to do likewise. Each warrior practices his function until he is able to react with lightning speed to any situation. The result of such intense and effective training is an army that can think faster, act more decisively and is more proficient than any other. High Elf soldiers rely heavily on their excellent training and peerless discipline to survive against foes far more brutal and savage.

Models with this special rule (but not any mounts) may re-roll all To Hit rolls of 1 when making close combat attacks.