Question: What was the location of the German campaign in the country that Luis Matias is from?

full_context: Document 1: Luis Matias: Luis Matias (born 29 September 1986 in Luanda) is an Angolan swimmer, who represented Angola at the 2004 Summer Olympics in the Men's 100 metre butterfly. While he won heat 1 with a time of 58.92, he finished in 58th place out of 60 spots and did not advance.
Document 2: Military history of South Africa during World War II: On 4 September 1939, the United Party caucus refused to accept Hertzog's stance of neutrality in World War II and deposed him in favour of Smuts. Upon becoming Prime Minister, Smuts declared South Africa officially at war with Germany and the Axis. He immediately set about fortifying South Africa against any possible German sea invasion because of South Africa's global strategic importance controlling the long sea route around the Cape of Good Hope.
Document 3: Northern Seven Years' War: 1762 brought two new countries into the war. Britain declared war against Spain on 4 January 1762; Spain reacted by issuing their own declaration of war against Britain on 18 January. Portugal followed by joining the war on Britain's side. Spain, aided by the French, launched an invasion of Portugal and succeeded in capturing Almeida. The arrival of British reinforcements stalled a further Spanish advance, and the Battle of Valencia de Alcántara saw British-Portuguese forces overrun a major Spanish supply base. The invaders were stopped on the heights in front of Abrantes (called the pass to Lisbon) where the Anglo-Portuguese were entrenched. Eventually the Anglo-Portuguese army, aided by guerrillas and practicing a scorched earth strategy, chased the greatly reduced Franco-Spanish army back to Spain, recovering almost all the lost towns, among them the Spanish headquarters in Castelo Branco full of wounded and sick that had been left behind.
Document 4: German campaign in Angola: Before the official declaration of war between Germany and Portugal (March 1916), German and Portuguese troops clashed several times on the border between German South West Africa and Portuguese Angola. The Germans won most of these clashes and were able to occupy the Humbe region of southern Angola until Portuguese control was restored a few days before the British campaign out of South Africa defeated the Germans.
Document 5: History of Angola: Angola is a country in southwestern Africa. The country's name derives from the Kimbundu word for king. It was first settled by San hunter - gatherer societies before the northern domains came under the rule of Bantu states such as Kongo and Ndongo. From the 15th century, Portuguese colonists began trading, and a settlement was established at Luanda during the 16th century. Portugal annexed territories in the region which were ruled as a colony from 1655, and Angola was incorporated as an overseas province of Portugal in 1951. After the Angolan War of Independence which ended with an army mutiny and leftist coup in Lisbon, Angola's independence was achieved on November 11, 1975 through the Alvor Agreement. After independence, Angola later entered a period of civil war that lasted up until 2002.
Document 6: Rim Ju-song: At the time when he was selected, he was living in Beijing. By the time North Korea received clearance to compete in London, it was "too late to qualify for most events, but swimming was an exception". Thus North Korea's representative would have to be a swimmer. Rim, who did not know how to swim, began to learn the crawl stroke in April 2012, reportedly with great difficulty at first, and the breaststroke in May.
Document 7: Sikhounxay Ounkhamphanyavong: Described as "the big name of Laotian swimming", he represented his country at the 2000 Summer Olympics in Sydney, in the men's 50 metre freestyle. He had trained in one of the world's poorest countries, "where the largest pool is 25 meters long – half the Olympic distance". A reporter for the Australian Broadcasting Corporation noted that "a 25m pool badly in need of cleaning is [his] only place to train." Ounkhamphanyavong finished last in his heat, with a time of 27.03, and did not advance to the semi-finals.
Document 8: Aluizio Lage: Aluizio Courrage Lage (born March 11, 1919) is a former Olympic freestyle swimmer from Brazil, who participated at one Summer Olympics for his native country.
Document 9: History of Germany during World War I: During World War I, the German Empire was one of the Central Powers that lost the war. It began participation in the conflict after the declaration of war against Serbia by its ally, Austria - Hungary. German forces fought the Allies on both the eastern and western fronts, although German territory itself remained relatively safe from widespread invasion for most of the war, except for a brief period in 1914 when East Prussia was invaded. A tight blockade imposed by the Royal Navy caused severe food shortages in the cities, especially in the winter of 1916 -- 17, known as the Turnip Winter. At the end of the war, Germany's defeat and widespread popular discontent triggered the German Revolution of 1918 -- 19 which overthrew the monarchy and established the Weimar Republic.
Document 10: Youba Hmeida: Hmeida qualified for the Mauritanian squad in the men's 400 metres at the 2004 Summer Olympics in Athens by receiving a wild card entry slot from IAAF. Running against seven other athletes in heat three, Hmeida crossed the finish line in last place by more than three seconds behind leader Anton Galkin of Russia with a time of 49.18. Hmeida failed to advance into the semifinals as he placed farther from two automatic slots for the next round and ranked no. 58 overall in the prelims. Hmeida was appointed as the Mauritanian flag bearer by the National Olympic Committee () in the opening ceremony.
Document 11: British Empire: Britain's fears of war with Germany were realised in 1914 with the outbreak of the First World War. Britain quickly invaded and occupied most of Germany's overseas colonies in Africa. In the Pacific, Australia and New Zealand occupied German New Guinea and Samoa respectively. Plans for a post-war division of the Ottoman Empire, which had joined the war on Germany's side, were secretly drawn up by Britain and France under the 1916 Sykes–Picot Agreement. This agreement was not divulged to the Sharif of Mecca, who the British had been encouraging to launch an Arab revolt against their Ottoman rulers, giving the impression that Britain was supporting the creation of an independent Arab state.
Document 12: Germans: In 1866, the feud between Austria and Prussia finally came to a head. There were several reasons behind this war. As German nationalism grew strongly inside the German Confederation and neither could decide on how Germany was going to be unified into a nation-state. The Austrians favoured the Greater Germany unification but were not willing to give up any of the non-German-speaking land inside of the Austrian Empire and take second place to Prussia. The Prussians however wanted to unify Germany as Little Germany primarily by the Kingdom of Prussia, whilst excluding Austria. In the final battle of the German war (Battle of Königgrätz) the Prussians successfully defeated the Austrians and succeeded in creating the North German Confederation.
Document 13: Vadym Lepskyy: Lepskyy competed for the Ukrainian team in a medley double at the 2008 Summer Olympics in Beijing. Leading up to the Games, he cleared FINA B-standard entry times of 2:02.94 (200 m individual medley) and 4:21.16 (400 m individual medley) at the Multinations Swim Meet in Prague, Czech Republic. On the first day of the Games, Lepskyy cruised to sixth place in the final heat and twentieth overall by thirteen seconds behind U.S. swimmer and all-time Olympian Michael Phelps (4:07.82) in 4:20.96. In the 200 m individual medley, Lepskyy challenged seven other swimmers on the second heat, including two-time Olympian and California Bears swimmer Miguel Molina of the Philippines. He raced to third place by 0.12 of a second behind Molina with a time of 2:01.73. Lepskyy failed to advance into the semifinals, as he placed twenty-eighth overall in the preliminaries.
Document 14: Łukasz Labuch: Lukasz competed in the 2004 Summer Paralympics winning a silver medal in the T37 100m, he also finished fourth in the 200m and eighth in the long jump.
Document 15: Portugal: In the 20th century, Portugal engaged in two major conflicts: World War I and the Portuguese Colonial War (1961–1974). After the end of the Portuguese Empire in 1975, the Portuguese Armed Forces have participated in peacekeeping missions in East Timor, Bosnia, Kosovo, Afghanistan, Somalia, Iraq (Nasiriyah) and Lebanon. Portugal also conducted several independent unilateral military operations abroad, as were the cases of the interventions of the Portuguese Armed Forces in Angola in 1992 and in Guinea-Bissau in 1998 with the main objectives of protecting and withdrawing of Portuguese and foreign citizens threatened by local civil conflicts.
ground_truth: Portuguese Angola
sub_queries: Where was Luis Matias from? Answer: Angola
German campaign in Angola >> location Answer: Portuguese Angola