The partisan forces of EDES and ELAS collaborated with the British agents in the greatest moment of the Greek Resistance against the powers of the Axis. The blowing of the bridge imposed a major blow on the supply line of the German forces regarding the North African front.
A total of 86 ELAS partisans, 52 EDES partisans, and 14 British commandos faced 100 Italian and 5 German soldiers who guarded the bridge. The attack was a diversion for the placing of the explosives around the pillars of the viaduct.