The video explains all. Watch the entire thing. It is incredible.
The battle of Trafalgar took place alongside the coast of Southern Spain, during the Napoleonic wars. It consisted of The Spanish and French Empires vs. The British Empire.
Although the British lost, the leader of The Spanish Fleet, was killed in action aboard the largest ship in the world at the time, The Santissima Trinidad.
(This is an alternate ending, in reality, The British won, and both French and Spanish fleets were destroyed. However, this battle doesn't occur until the 1800's.)