When the Minbari and humans first met, a single event led them to war.
The Minbari ships turned towards the Prometheus and engage their long-range sensors to gain more data on the unknown Earth ship. Unknown to the Minbari, the intense EMP field generated by their long range sensors disabled the Prometheus' jump engine, preventing the Earth ship from retreating. As the Minbari ships draw closer, they open their gun ports; a sign of respect in their culture. The interference from the Minbari sensors also prevents the Prometheus from determining whether or not the Minbari ships are charging their weapons. The captain of the Prometheus, with his jump engines disabled and the Minbari ships approaching with apparent intent to fire, misinterprets this as a sign of aggression and opens fire. The Minbari ships are heavily damaged, and their beloved leader, Dukhat, is killed. In retaliation, the Grey Council declares war against humanity, and the Earth–Minbari War begins.
The Minbari with their superior technology almost destroyed the entire human civilization within just two years.
What Earth did not know - but the average Minbari may have known - is that Delenn cast the tie-breaking vote to declare war. I know some decisions by the Grey Council are secret (e.g. - the reason why Minbari warriors were ordered to surrender to humans when the Minbari were on the verge of total victory), but I don't know if they are all secret. I also assume the average Minbari knew why they were going to war; because those humans killed our leader in an unprovoked attack. So we have some decisions where the public is informed of the reason why, and others where the public is not informed.
Did the Minbari ever tell the humans (or anyone else) who cast the vote to declare war?
In accordance with my "Quotes Get Votes" policy, please provide quotes, links, or citations from canon sources in your answers. Sources may include statements by JMS or others associated with writing or producing the show, B-5 episodes, B-5 TV movies, related shows, and novels.