"The Portuguese Expedition to Abyssinia in 1541-1543" by Miguel de Castanhoso is a captivating and detailed account of the Portuguese military expedition led to aid the Ethiopian Empire against Muslim invasions in the 16th century. Castanhoso, a Portuguese soldier who took part in this campaign, offers a first-hand perspective on the events, challenges and cultural interactions that marked this historic expedition. The book begins by describing the geopolitical situation at the time, with the Ethiopian Empire, also known as Abyssinia, under constant threat from Muslim forces led by Imam Ahmad ibn Ibrahim al-Ghazi, nicknamed "Gragn". In response to a call for help from the Ethiopian emperor Gelawdewos, the King of Portugal sent an expeditionary force led by Cristóvão da Gama, son of the famous explorer Vasco da Gama. Castanhoso gives a detailed account of the preparations for the expedition, the perilous journey across the Red Sea and the first contacts with the Ethiopians. He describes the fierce battles, the military strategies employed and the alliances forged between the Portuguese and the Ethiopian forces. The story highlights the courage and determination of Portuguese soldiers in the face of considerable adversity, including difficult terrain, a hostile climate and powerful enemy forces. Castanhoso's text is rich in detail about the cultural encounters between Europeans and Africans. He describes the customs, traditions and religious practices of the Ethiopians, offering valuable insights into daily life and society at the time. These descriptions enhance understanding of cross-cultural interactions and how these relationships influenced the course of the expedition. The book concludes with a description of the decisive battle of Wayna Daga, where the combined forces of the Portuguese and Ethiopians succeeded in defeating Gragn's army. This victory marks a crucial turning point in the safeguarding of the Ethiopian Empire and underlines the importance of Po