The Defence Secretary Philip Hammond was present for a major Anglo-French naval exercise involving around a quarter of the British fleet.
The Navy flagship HMS Bulwark was the centre of attention in the drills that were designed to test both nations' naval response to unexpected world events at short notice.
It was one of the first joint exercises under the Combined Joint Expeditionary Force (CJEF) - an initiative agreed in 2010 to work more closely with French allies.
More top news
MI5 face mounting pressure over claims the IS executioner 'Jihadi John', named yesterday as a London graduate, was known to them
Labour leader Ed Miliband is due to set out his party's plans on how it would cut tuition fees.
New drug driving laws are to come into effect next week, including laws on some prescribed medications.