Short answers, pulled from the story.
The campaign in south-west France ran from late 1813 into the spring of 1814 as the final campaign of the Peninsular War. It closed when opposing commanders signed a local armistice on the 17th of April 1814. That followed news that Napoleon had been deposed as Emperor of the French and that a general armistice, the Treaty of Fontainebleau, had been ratified on the 11th of April.
Arthur Wellesley, Marquess of Wellington, led the Allied army of British, Portuguese and Spanish troops. Marshal Jean de Dieu Soult commanded the opposing French forces.
The campaign ended with the capture of Toulouse and the siege of Bayonne in south-west France. Wellington entered Toulouse on the 12th of April 1814, after Soult withdrew toward Villefranque overnight.
News traveled slowly across the front. Napoleon abdicated on the 4th of April 1814, but a French sortie from Bayonne on the 14th of April still cost each side about 1,000 men after peace had effectively already been made.
At the Battle of Toulouse on the 10th of April 1814, the French fielded about 40,000 men with 80 guns, not counting local National Guard units. The Allies had under 52,000 men with 64 guns.
Napoleon was deposed as Emperor of the French and was permitted to reside on the island of Elba, its sovereignty conceded to him by the allied powers. Louis XVIII was restored to the French throne in his place.