Mequinenza's town wall was old and weak, but its castle perched on a mountain spur above the town was a formidable position. It took Suchet's military engineers two weeks to construct a zig-zag road up the mountain. Once the road was ready, the French dragged their siege cannons to the top and opened fire on the castle. The town was successfully stormed on 5 June. After eight days of bombardment the castle was a ruin and Carbon surrendered. Since Mequinenza was at the head of navigation on the Ebro, Suchet was able the use the town as a supply base in his subsequent operations during the Siege of Tortosa in the winter of 1810 and 1811.