The attack on Chaves, which occurred on 8 July, 1912, was a military action performed by supporters of the monarchy of Portugal in opposition to the Portuguese First Republic, which had been proclaimed two years prior. The attack was led by Henrique Paiva Couceiro, who had campaigned in Africa and who became the leader of the royalists. The royalists were discreetly armed by the Spanish king, Alfonso XIII, and concentrated their forces in Galicia. The attack ended with a defeat for the royalist forces.