1762 brought two new countries into the war. Britain declared war against <answer>Spain</answer> on 4 January 1762; <answer>Spain</answer> reacted by issuing their own declaration of war against Britain on 18 January. Portugal followed by joining the war on Britain's side. <answer>Spain</answer>, aided by the French, launched an invasion of Portugal and succeeded in capturing Almeida. The arrival of British reinforcements stalled a further Spanish advance, and the Battle of Valencia de Alcántara saw British-Portuguese forces overrun a major Spanish supply base. The invaders were stopped on the heights in front of Abrantes (called the pass to Lisbon) where the Anglo-Portuguese were entrenched. Eventually the Anglo-Portuguese army, aided by guerrillas and practicing a scorched earth strategy, chased the greatly reduced Franco-Spanish army back to <answer>Spain</answer>, recovering almost all the lost towns, among them the Spanish headquarters in Castelo Branco full of wounded and sick that had been left behind.
Identify a new country that joined the war in 1762?
Spain