UNSC Trafalgar was a UNSC Punic-class supercarrier and the core of the Epsilon Eridani Carrier Group and was seen as the pride of the UNSC Navy. Trafalgar saw action and was destroyed at the Fall of Reach. Any other actions the carrier may have been involved in are as yet unknown.
The Battle of Trafalgar was a decisive naval engagement during the Napoleonic Wars between the British Empire and the French and Spanish Empires. Vice-Admiral Horatio Nelson, the British commander, was killed by sniper fire during the battle, but due to his tactics and the skill of his captains and crews, the British fleet captured most of the Franco-Spanish fleet and sent the rest fleeing, while the British didn't lose a single ship.