Between the autumn of 1812 and the late summer of 1813 campaigning in the peninsula took on a new aspect. From being a defence of Portugal and those parts of Spain not under French control, it became an effort by the British, Spanish and Portuguese forces to drive the French out completely. Operations at the end of 1812 included the unsuccessful British siege of Burgos and the subsequent retreat; renewed campaigning on the east coast of Spain, including Murray"s actions around Tarragona; and the beginning of the final offensive against the French, including the epic battles of Roncesvalles, Maya and Sorauren.