Fog of War
No matter how disciplined the army and ordered the plan, a battlefield is chaos. Smoke, noise, hidden enemies and fear can all lead to disorganization. Even in the modern age, mistaken identity leads to "friendly fire" casualties. This Gift exacerbates this problem to often devastating effect. A commander might not see advancing foes, or see foes that aren't there; a team may fire upon allies, or mistake a command to "advance" for a call to "retreat." This Gift is taught by a raven- or other trickster-spirit.