Dortmund's Guinean forward #09 Serhou Guirassy celebrates scoring the opening goal during the German Cup (DFB Pokal) first round football match between Rot-Weiss Essen and BVB Borussia Dormund in Essen, western Germany. AFP
Five-time German Cup winners Dortmund struggled against their third division opponents, carving out few opportunities.
With the match drifting towards extra time, Guirassy collected the ball outside the penalty area and hit a low shot inside the right post to take the lead for the visitors.
In stoppage time, Essen midfielder Kelsey Owusu fouled Dortmund wingback Yan Couto and the Brazilian needed to be stretchered from the pitch.
Dortmund and Essen lie 35 kilometres away from each other in Germany's crowded and football-mad Ruhr region.
The last time the two sides met was in 2008, when future Liverpool coach Jurgen Klopp made his debut as Dortmund manager.
Klopp would go on to win two Bundesliga titles and one German Cup as Dortmund coach, along with taking the club to the 2013 Champions League final, where they lost to rivals Bayern Munich.
Earlier on Monday, Mainz, Hertha Berlin and Fortuna Duesseldorf also made it through their first round ties against lower division opposition.
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