The Battle of Sorauren was part of a series of engagements in late July 1813 called the Battle of the Pyrenees in which a combined British and Portuguese force under Sir Arthur Wellesley held off Marshal Soult's French forces attempting to relieve Pamplona. On the 30th the retreat from Sorauren cost the French 3,500 casualties, as the French tried to get between Wellesley's army and San Sebastian. At Beunza, 5100 Portuguese and 4000 British fended one attempt off.