Question: When was the football team became active which was represented by Manfred Eglin in 1956 Summer Olympics?

Football (Bulgarian: футбол , "futbol") is the most popular sport in Bulgaria.  It was introduced in 1893–1894 by Swiss gymnastics teachers invited to the country.  A football (initially called ритнитоп, "ritnitop", "kickball") match was first played in Varna's High School for Boys in 1894, where it was introduced by Georges de Regibus, and the game was brought to Sofia by Charles Champaud the following year.  The rules of the game were published in Bulgarian by Swiss teachers in the "Uchilishten pregled" magazine in 1897, and football continued to gain popularity in the early 20th century.  Among the founders of the Turkish team Galatasaray S.K. in 1905 was the Bulgarian Lycée de Galatasaray student Blagoy Balakchiev, and the first Bulgarian club, "Futbol Klub", was established in Sofia in 1909 on the initiative of Sava Kirov.  PFC Botev Plovdiv was founded in 1912, PFC Slavia Sofia in 1913, and PFC Levski Sofia in 1914.  The Bulgaria national football team debuted on 21 May 1924 in a 1924 Summer Olympics qualifier, losing 0–6 to Austria in Vienna.  What is today PFC CSKA Sofia was established on 5 May 1948.  In the 1950s and 1960s Bulgarian football achieved its biggest Olympic success, being third in the 1956 Summer Olympics in Melbourne and second in the 1968 Summer Olympics in Mexico City, also finishing fifth in Euro 1968.  In 1962, Bulgaria first qualified for a FIFA World Cup tournament, in total of seven participations to date.  In the 1986 FIFA World Cup, Bulgaria did reach the round of 16.  Then, in the 1994 FIFA World Cup, came Bulgaria's biggest World Cup success, the fourth place, the elimination of reigning world champions Germany and Hristo Stoichkov's top goalscorer prize. <SEP>  It has been active since 1908, and first competed in 1912.  Olympic football was originally an amateur sport, and as the pre-World War II German national team was also amateur, it was able to send a full national team to the games.  After the war, Germany was divided, but until 1964 East and West competed under the name of "United Team of Germany", although without a combined squad.  From 1968 West Germany began to compete on its own, but were still forced to send an amateur team, who were not able to match the success of their professional counterparts in the World Cup and European Championship.  The rules on amateurism were relaxed in the 1980s, which allowed West Germany some success, notably a bronze medal finish in 1988.  Since 1992 the tournament has been competed by under-23 teams, making Germany's Olympic qualification dependent on the results of the under-21 team.  Only in 2016 the Germans returned to the Olympic stage, with a silver medal after losing on a penalty shoot-out to hosts Brazil. The Germany Olympic football team represents Germany in international football competitions in Olympic Games.  Reunified Germany is now the only World Cup champion without the Olympic gold. <SEP> Colonel John William Russell (born February 2, 1920) was an American equestrian who won a bronze medal at the 1952 Summer Olympics in Helsinki.  After serving in the United States Army during World War II, he began competing in international equestrian tournaments and was eventually selected to join the United States team at the 1948 Summer Olympics in London.  After his success at the 1952 edition, he continued to participate in events around the world, but military duties and a broken bone in his horse caused him to miss the 1956 Summer Olympics.  He retired from active competition that year and became the head of United States Modern Pentathlon Training Center, where he coached six United States Olympic modern pentathlon delegations, twenty-two World Championship teams, and helped organize two World Modern Pentathlon Championships.  He retired and opened the Russell Equestrian Center and was inducted into the United States Show Jumping Hall of Fame in 2001. <SEP>  Born in Karlsruhe, Eglin played for Karlsruher FV and Stuttgarter Kickers, and represented Germany in the 1956 Summer Olympics. Manfred Eglin (10 October 1935 – 10 August 2001) was a German footballer who played as a goalkeeper.