The Battle of Zambrano was an historic battle fought on the planetSolais V during the fifteen centuries of Solari wars. This battle occurred in the far northern hemisphere of the planet, near to the pole.
The battle was not referenced in dialogue, but rather appeared on an okudagram that Data and Riva were reviewing while attempting to select a negotiation site on the planets surface. The battle was named after episode writer Jacqueline Zambrano. (Star Trek Encyclopedia (3rd ed., p. 574))