The 2009-10 campaign marked a pivotal and historic return for 1. FC Union Berlin, as Eisern Union firmly re-established themselves in the 2. Bundesliga after a long climb through the lower divisions, securing a safe 12th-place finish. This crucial season saw the club return to its spiritual home, the newly renovated Stadion An der Alten Försterei, playing in front of their passionate, faithful fans. Leading the charge was the beloved cult hero and midfield maestro, Torsten Mattuschka, whose 10 crucial goals anchored the attack and proved vital in a campaign built on the unyielding fight and spirit of the 'Iron Union' under manager Uwe Neuhaus. It was a year of successful consolidation that cemented their place back in the professional ranks and remains a defining chapter in the club's modern history.