Lots of events are taking place this year to commemorate the 200th anniversary of the Royal Navy's victory of French and Spanish forces at the Battle Of Trafalgar.
The Queen helped start the festivities by inspecting a massive fleet of ships which had gathered off the coast of Portsmouth.
Press Packer Henry was there.
"I'm a marine cadet at TS Eastbourne. I was in Portsmouth to take part in the International Fleet Review. There are 167 ships from around the world which the Queen inspects.
More than 25,000 people are taking part. The Navy has changed a lot these days and now works closely with the Army and Air Force.
In 1805, Nelson led the British fleet into victory against the much larger French and Spanish fleet.
Nelson died during the battle, but he is remembered for putting a stop to Napoleon's plans to invade the UK and guaranteed Britain's control of the seas.
The biggest ship here today is the French Charles de Gaulle. She makes some of the other ships look like toys!"
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