"Yet Dom Sebastian persisted; he would be crusader rather than politician, and he was determined to fight the Mohammedans. …The king spoke only of a visit to Tangier, and started off suddenly with his guards and courtiers from a hunting excursion, ordering the Duke of Aveiro to follow with a force of four hundred cavalry and one thousand two hundred infantry. With these troops Dom Sebastian made a few raids, and exhibited his personal courage by uselessly exposing his person, and he returned more bent than ever on a great war in Africa … As the country [Portugal] was nearly drained of men the king had to hire mercenaries belonging to different nations, who were not properly equipped. ... The preparations made for the campaign were ridiculous in the extreme; all the most experienced generals and most tried Portuguese soldiers were in India, and the Portuguese troops who were enlisted consisted of a few old veterans whose time had expired in Asia, and of youthful raw recruits. These latter were not in the least disciplined … On the 24th of June, 1578, King Sebastian set sail with a fleet of fifty ships of war and about nine hundred transports … carrying fifteen thousand infantry, two thousand four hundred cavalry, and thirty-six guns. Of this army only about ten thousand were Portuguese, the rest consisting of Spanish and German volunteers and mercenaries, and of nine hundred Italians, under the command of a gallant Englishman, Sir Thomas Stukeley." (in: H. Morse Stephens: The Story of Portugal, id., pp. 244-245/251-252).
"The slaughter was terrible; more than nine thousand Christians were killed, and the rest, except about fifty, were taken prisoners. … Dom Sebastian throughout the battle behaved himself as a gallant knight, though he had not been a prudent general, and when the fortunes of the day went against him he determined to lose his life also. ... Many account are given to his death. One tradition says that he was taken prisoner by some Moors, who stripped him of his arms, and began to quarrel about him, and that a Mohammedan general rode in against them and shouting out, 'What, you dogs, when God has given you so glorious a victory, would you cut each other’s throats about a prisoner,' immediately struck the King of Portugal down in ignorance of his rank. Another story is that the king met Dom Luis de Brito with the consecrated banner wrapped around him, and said, 'Hold it fast, let us die upon it;' and that when, after fierce fighting, Brito was taken prisoner with the banner, he saw the king riding away unpursued. Dom Luis de Lima also asserted that he saw the king making his way towards the river unhurt. ... According to the most trustworthy account, Christovão de Tavora, the king’s equerry, showed a flag of truce, and offered to surrender with the fifty horsemen, who still remained about the king, when Sebastian suddenly dashed on the Moorish cavalry, who, irritated at this breach of faith, instantly slew him, as well as the brave equerry, who followed his master. Anyhow, it is certain that the new Sherïf Ahmed ibn Mohammed sent out Sebastião de Resende, a gentleman of the bedchamber, to discover the corpse of the king, and that a naked body was brought in covered with wounds, which the Portuguese prisoners at once recognized as that of the ill-fated Dom Sebastian. The body was temporarily buried in the palace at Alcacer Quibir, and removed in the following September to Ceuta, at the request of Cardinal Henry. It was eventually taken to Portugal in 1582, by the orders of Philip II., and buried with great pomp in the church of St. Jerome at Belem. … for many years the lower classes of the Portuguese people refused to believe that their sovereign was dead, a belief encouraged by the stratagem of a wounded noble on the evening of the fatal battle to gain admission into the city of Tangier by asserting that he was the king. It was this belief which led to the acceptance of the successive false Dom Sebastians, who played a part in the ensuing half century ... That the … Hidden Prince would appear again became a religion, and the sect of the Sebastianistas became a powerful body of fanatics. … the remark of Lord Tyrawley, in the English House of Lords in 1763: "What can one possibly do with a nation, one half of which expect the Messiah, and the other half their king, Dom Sebastian, who has been dead two hundred years?" (in: H. Morse Stephens: The Story of Portugal, id., pp. 255-257).