General Hope's Corps [ two British Divisions and two independent brigades] was detached from the main army to besiege the town of Bayonne. Soult had left General Thouvenot in command of 14,000 troops to hold the city. On the 13th April word reach the area that Napoleon had fallen. The relaxed atmosphere of the allied camp was shattered when on the 14th April Thouvenot, with 6,000 men, launched an attack on the allied lines. Outposts and front lines quickly fell but determined resistance and then a counter-attack drove the French back into the city. The seige continued and Thouvenot finally surrendered the city on the 26th April, twenty days after Napoleon's abdication.
This ended the Peninsular Campaign.