After Redoubt Berlaimont came under heave fire for three days, this too was evacuated by the Spanish in the night of 21 May. The attackers now had the entire covered passage under their control, and could now move their guns close to the city. From 24 May, the fortifications in the main area of attack came under massive gun and mortar fire. On 25 May the Spanish were driven out of the interior covered passage after heavy fighting. A mine detonated by them killed many attackers.