The 2019-20 campaign was an historic debut for Union Berlin in the Bundesliga, as Eisern Union firmly secured their top-flight status by finishing a respectable 11th place in their first-ever season in the German elite. Leading the charge was the clinical Swedish striker Sebastian Andersson, whose 12 league goals were vital. The season will be forever remembered for landmark victories, including a shock 3-1 home win against Borussia Dortmund and the emotional 1-0 triumph in the first-ever Bundesliga Berlin Derby against rivals Hertha BSC. This foundational year, built on grit and the passionate unity of the fans and the team under manager Urs Fischer, marked the club's successful transition to the big stage and remains a defining, golden chapter in their history.