In 1808, General Sir John Moore took over the British forces in the Peninsular War.
After a series of victories over the French in December, the British received news that 150,000 French under Napoleon were moving against them and that only a retreat to Corunna could save the army. In appalling winter conditions, they retreated over the mountains towards the coast losing over 3,000 men.
Political considerations, climate and fierce rear-guard actions caused Napoleon to leave the pursuit to Marshall Soult and his corps of 16,000 men.
On 16th January 1809, 14,000 British fought against the French at the Battle of Corunna. The French were beaten back with 1,500 casualties, the British losing 800: Sir John Moore was mortally wounded at the moment of victory.

Map courtesy of Wikipedia
The victory enabled the army to embark the next day and to continue the fight against Napoleon under a certain Sir Arthur Wellesley, later the Lord Wellington: one of the last acts before embarkation was the burial of Sir John Moore by the 9th Foot on the city ramparts.

Other Links
Cabarfeidh website
p.s. I served in the 1st Battalian the Royal Anglian Regiment from 1983-1990. The 9th Foot, in the 3rd Division under Fraser were the forerunners of that regiment. Corunna is one of the regiments battle honours.