Detailed Instructions: You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.
Q: Paragraph- Sent 1: Two years later Muslim forces rallied again, retaking Silves, and the Reconquista stumbled on for another half century.
Sent 2: So many inter-religious alliances reigned, and so pervasive was the intermingling of Moors and Christians, that it was hard to tell who was on which side and for which piece of land they were fighting.
Sent 3: On top of that, the situation was further clouded by a feud between Portugal and Spain, each of them claiming sovereignty over the Algarve.
Sent 4: However, by 1249 Faro and the western Algarve were retaken under King Afonso III, completing the Reconquest.
Sent 5: The possibility of war with Spain was averted by an expeditious royal marriage, and by the end of the century a treaty with Spain drew up the boundaries of Portugal that stand today.
Sent 6: The Algarve was a region regarded separately within the new Portugal, as is evidenced by the royal title "Kingdom of Portugal and the Algarve." In those days, the notion of the Algarve as a distinct entity did make some sense: like an island, it was cut off to the south and west by the Atlantic, to the east by the Guadiana River, and to the north by the mountains.
Sent 7: The region's titular autonomy was upheld until 1910, when the monarchy itself was overthrown.
Sent 8: The Navigator In 1415, long after the Reconquista was completed, a Portuguese fleet assembled on the River Tagus in Lisbon for an assault on the Moors in their homeland.
Sent 9: Crossing the Straits of Gibraltar, the armada attacked and seized the North African city of Ceuta.
Sent 10: An illustrious member of the famous raid was the young Prince Henry, half Portuguese and half English, the son of King João I and his wife, Philippa of Lancaster.
Sent 11: Ceuta would be Henry's one and only military victory, though he was destined to establish Portugal as a major world power, helping to develop important world trade routes by the time of his death in 1460.
Sent 12: At the age of 21, Henry assembled a School of Navigation.
Sent 13: It was certainly not a formal institution of lectures and classes, but probably resembled an informal modern-day "think-tank." Prince Henry — made governor of the Algarve in 1418 — had the money, influence, enthusiasm, and vision to lead and cajole the best astronomers, cartographers, boat-designers, and seamen of the day to expand Portugal's maritime horizons.
Sent 14: The waters at the western extreme of the Algarve were all that was known to sailors.
Sent 15: Once they were beyond Cabo de São Vicente, they faced the unknown, with no communications and no possibility of rescue if the voyage turned out badly.
Sent 16: Yet out into the unknown they went; for the glory of God and country, and in search of personal fame and fortune.
Sent 17: Their mission was made easier by the craft Algarve shipwrights had developed, a successor to the lumbering ships of the day: the caravel.
Sent 18: It was light, fast, and very maneuverable.
A:
How did Prince Henry secure and establish Portugal as a major world power?