Conversation so far:
What was the goal of waging the Battle of Trafalgar
Victory at the Battle of Trafalgar ensured that Napoleon would never invade Britain. Nelson, hailed as the savior of his nation, was given a magnificent funeral.
When did the Battle of Trafalgar occur
The Battle of Trafalgar was fought on October 21, 1805.

Question: What countries were involved in the battle
Self-contained rewrite: What countries were involved in the battle of Trafalgar