90+ fan groups protested Borussia Dortmund's Bundesliga opener against the club's Rheinmetall sponsorship, using a dummy tank.

Borussia Dortmund's Bundesliga opener witnessed fan protests against the club's sponsorship deal with arms manufacturer Rheinmetall. Fans used a dummy tank during the match to express their disapproval. Over 90 fan groups oppose the three-year sponsorship deal, raising concerns about the connection between sports and weapons industries.