First Fernandine War

In 1370, Portuguese forces Sacked the Andalusian port city of Cádiz to stop Castilian maritime activities and assert Portuguese naval presence in the region. The raid resulted in significant damage to the city and big Profit for the Portuguese and their naval operations.^[16]

In the same year, an armada headed for Seville consisting of thirty-two galleys and thirty ships. That were under the command of Admiral Lançarote Pessanha and Captain-Major João Focim, a Castilian knight exiled in Portugal Launched a naval blockade on Seville. The main objective was to immobilize the Castilian fleet and block supplies to Seville.^[17]

In 1370, Castilian forces laid siege to the town of Monção, located in northern Portugal. The defenders, led by Captain Vasco Gomes de Abreu and his wife, Deu-la-Deu Martins, faced dire conditions. According to local legend, Deu-la-Deu Martins baked a small amount of bread and threw it over the walls to deceive the besiegers into thinking the town had ample supplies. This ruse led to the lifting of the siege and a Portuguese victory.^[18][19][20]

The Battle of Porto de Bois was the Decisive last engagement during the First Fernandine War. Portuguese and Castilian armies clashed near the Pambre River. The Portuguese and their Galician Supporters were Crushed by the Castillan and French Coalition, ending the First Fernandine War^[21]

The First Fernandine War concluded in 1371 with the signing of the Treaty of Alcoutim, which temporarily halted hostilities between Portugal and Castile. However, Portugal betrayed the Castilian treaty, eventually leading to the Second Fernandine War in 1372.^[22]