[4] In addition to being a physician, Forchhammer was also a sportsman, developing an interest in cricket and football in the 1880s, two sports that at the time were still practically unknown in the country.

[6] When Kjøbenhavns Boldklub (KB) took the initiative to look at the different forms of football and their laws in 1886, Holger from FSK was asked to be involved and he accepted.

This triple function as a player, coach, and referee with a total of 55 appearances made him the figure with the most first-division matches in a European league in the 19th century.

[1] From time to time, Forchhammer attended parties organized by AB, where he enjoyed himself with his old clubmates such as lecturer Carl Andersen and ophthalmologist Niels Høeg, but despite the big age difference, Holger Forchhammer still understood how to get along with the club's young people, not in the sense that he immediately became good friends with them, but he had a great understanding of the importance of sports for the youth.

[3] In 1920, at the age of 54, Forchhammer was included in the Danish squad that competed in the football tournament of the 1920 Olympic Games in Antwerp.

[2] This happened because the squad itself had 20 players, so the final list contained 2 more names to fill all 22 places, Kristian Middelboe, who had already retired and was representing the Danish football federation, and Forchhammer, who was a medical doctor assisting the team.

[9] Forchhammer was a man without regard for personal gain and that was not afraid to risk his life for others, and as such, at the greatest risk to his own life, he was the soul of the rescue work when Vallø Castle burned in 1893, and was therefore rewarded with the rare recognition of the Medal for noble deeds, and has also received the Russian St. Anna order.