On September 20, 1519, five ships moved out from Sanlúcar de Barrameda and entered the Atlantic. Their departure was the ocean-going beginning of an expedition that had left Seville by river on August 10. The vessels carried sailors, officers, servants, craftsmen, weapons, trade goods and provisions under the command of Ferdinand Magellan, a Portuguese navigator sailing for the Spanish crown.
No one aboard could know that one ship would return three years later after completing the first recorded circumnavigation of the globe. The expedition’s stated purpose was commercial and imperial: find a westward route to the spice-producing Moluccas. Circumnavigation emerged from the voyage’s decisions, disasters and survival. Magellan himself would not complete it.
A Spanish route to the Spice Islands
European demand made cloves, nutmeg and other Asian spices immensely valuable. Portugal had developed an eastern sea route around Africa and into the Indian Ocean. Spain sought an alternative that would reach the Moluccas by sailing west and strengthen its claim under the rival crowns’ imperfect division of overseas worlds.
Magellan had experience in Portuguese service in Asia, but his proposal for a western route found support in Spain. King Charles I authorized the expedition. The resulting fleet, the Armada de Molucca, placed an international crew inside a Spanish imperial project. Portuguese mistrust followed Magellan, while tensions among commanders were present from the beginning.
The five ships were Trinidad, Magellan’s flagship; San Antonio; Concepción; Victoria; and Santiago. They differed in size and role, but all were small by modern standards for a voyage whose geographic uncertainties were enormous. Their cargo had to sustain Atlantic exploration, wintering, trade and a hoped-for crossing into another ocean.
From Seville to the ocean
The distinction between August 10 and September 20 matters. On August 10, the fleet departed Seville and traveled down the Guadalquivir. Sanlúcar stood at the river’s mouth, where ships completed preparations before the Atlantic passage. On September 20, the expedition sailed from Sanlúcar into open water. Both dates belong to the departure; they describe different stages.
From Spain, the fleet headed toward the Canary Islands and then crossed the Atlantic to the coast of South America. Its navigators searched southward for a passage through the continent. Maps offered hypotheses, coastlines of uneven reliability and vast blank spaces. Each inlet had to be evaluated against the possibility that it might open toward the sought-for sea.
Life aboard combined skilled work with confinement. Sailors adjusted rigging, pumped water, repaired damage, handled anchors and guarded provisions. Food deteriorated. Fresh water had limits. Command traveled through a hierarchy strained by distance from Spain and by disagreement over Magellan’s authority. None of those conditions needs invented dialogue to feel consequential; they were built into early modern ocean voyaging.
Winter, mutiny and loss
By 1520 the expedition had reached the cold southern coast of what is now Argentina. It wintered at Puerto San Julián. Isolation, worsening conditions and doubts about the route intensified conflicts among the commanders. A mutiny broke out during the Easter season. Magellan suppressed it, executed or punished leaders and reasserted control.
The episode was not an adventurous interlude; it was a struggle over command with deadly consequences. It also revealed the risks of an expedition whose legal authority, national loyalties and practical survival were bound together. Magellan could continue only if enough officers and men accepted—or were forced to accept—his leadership.
The fleet then lost Santiago in a wreck while the ship was scouting. Its crew survived, but the loss reduced the expedition to four vessels. Later, during exploration of the passage, San Antonio deserted and returned to Spain. The remaining ships were fewer, their supplies diminished and their return route uncertain.
Through the strait and into the Pacific
In October 1520, the expedition entered the labyrinth of channels at South America’s southern end. Narrow waterways, mountains, tides and uncertain branches made the passage a test of navigation and coordination. Magellan’s ships spent weeks working through the route that would later bear his name.
When the surviving three vessels emerged in late November, they entered an ocean Europeans did not yet understand in scale. Magellan called it peaceful in contrast with the waters behind him, but the crossing was anything but easy for the crews. The fleet had not provisioned for the true width of the Pacific.
Months passed with little opportunity to replenish food or water. Accounts describe hunger, disease and desperate consumption of degraded supplies. The crossing transformed the voyage’s geographic achievement into a human catastrophe. A route had been found, but it did not resemble the manageable corridor imagined at departure.
The Philippines and Magellan’s death
The expedition reached the Mariana Islands and then the Philippines in March 1521. There, navigation, diplomacy, trade and religious ambition became entangled. Magellan formed an alliance with Rajah Humabon of Cebu and supported conversion to Christianity. These relationships were not simple European commands imposed on passive communities. Local rulers pursued their own interests, rivalries and strategies.
That political world shaped the confrontation at Mactan. Magellan led an armed force against warriors under Lapulapu, a local leader who resisted Humabon’s alignment and Spanish demands. On April 27, 1521, Magellan was killed in the fighting. Contemporary narrative makes clear that the expedition’s commander died in a local conflict he had chosen to enter.
His death breaks the common shorthand of “Magellan’s circumnavigation.” Magellan commanded the expedition that found the westward passage into the Pacific, but he did not sail around the globe. After Mactan, the survivors reorganized under successive leaders. With too few men to operate three ships, they burned Concepción and continued with Trinidad and Victoria.
Elcano and Victoria complete the circuit
The expedition finally reached the Moluccas and loaded cloves. The two remaining ships then attempted different routes. Trinidad tried to return eastward across the Pacific but failed and fell into Portuguese hands. Victoria, commanded by Juan Sebastián Elcano, sailed west across the Indian Ocean.
Elcano’s route avoided Portuguese-controlled ports as far as possible and rounded the Cape of Good Hope. Hunger, disease and exhaustion again reduced the crew. When Victoria reached Sanlúcar in September 1522, eighteen European members of the original expedition were aboard. Other survivors returned by different paths or at later times, so the famous number eighteen should not be mistaken for the total number who ultimately survived.
Victoria then continued to Seville. Its cargo demonstrated the commercial promise that had launched the voyage, though the expedition’s financial accounting was as complicated as its human cost. The ship’s return established that a vessel could complete a westward circuit of the planet’s oceans. It did not make global travel easy; it proved how difficult the connected world actually was.
What the voyage changed
The circumnavigation gave European mapmakers and rulers empirical knowledge about the relative scale of oceans and continents. It demonstrated that the Pacific was far wider than many planners had expected. Logs, observations and Antonio Pigafetta’s surviving account helped translate experience into geographic memory.
The voyage also accelerated an imperial process. European navigation did not enter empty seas. The expedition encountered established societies, trade networks and political authorities across South America, the Pacific and Southeast Asia. Alliances, coercion, violence and conversion were part of the same history as measurement and seamanship.
Later commemoration often centered Magellan as a solitary visionary. A fuller account distributes agency. Spanish financiers and officials made the project possible; pilots and sailors kept ships operating; Indigenous knowledge and local politics shaped encounters; Lapulapu’s forces killed the commander; Elcano and the crew of Victoria completed the circuit. The achievement belonged to an expedition, not to one man alone.
Why September 20 matters
September 20 marks a threshold. At Sanlúcar, a plan left the protected river system and entered the ocean where its assumptions would be tested. The fleet sought a trade route; it found a strait, crossed an unexpectedly vast sea and became the first expedition to circle the globe only through adaptation after repeated loss.
Remembering the departure responsibly means holding achievement and consequence together. The voyage was an extraordinary feat of navigation and endurance. It was also part of European imperial expansion, and its path was shaped by encounters with people who had their own histories and aims. The world became more connected in European understanding, but never neutral.
Sources and editorial method
This article was checked against Spain’s national archival portal PARES entry for the Magellan–Elcano expedition, the multinational UNESCO Memory of the World nomination dossier and the Library of Congress copy of Antonio Pigafetta’s account of the voyage. Dates distinguish the August 10 departure from Seville, the September 20 sailing from Sanlúcar and the September 1522 return. Crew totals vary by roster and definition; this article avoids presenting one disputed departure total as certain. No dialogue, private thought or invented witness action has been added.
Continue with the September 20 Daily Edition, browse the Major Historical Events archive, or compare later voyages of discovery in DTiH’s stories on Pioneer 11 at Saturn and ICE’s first comet encounter.
Written, fact-checked and edited by the Discover Today in History editorial team. Last fact-check: September 21, 2026.
