the French fleet and Spanish treasure ships lay in the harbour of Redondela, surrounded by the Galician mountains. Château-Renault had taken charge of the defensive measures, and had blocked the narrow entrance, across the Rande Strait, with a boom made largely of timber and chain tightly bound together. At the north end of the boom was positioned a gun battery which, according to Rooke's journal, comprised "fifteen or sixteen" guns; at the south end sat Fort Rande sitting a little way up from the sea, consisting of a strong stone tower with platforms constructed for cannon. The space between the tower and the water's edge consisted of a fortified enclosure, at the bottom of which stood a battery commanding the straits. In total, the Rande fortifications had been armed with more than 30 guns. To supplement the French troops from the fleet, a number of levies were raised by the Prince of Barbançon, governor and captain-general of Galicia. Aboard the Royal Sovereign an Allied council of war discussed the options for the attack. The plan was to destroy the boom with English and Dutch ships, whilst the troops from the fleet would silence the shore defences. But the naval encounter would not be a conventional line-of-battle engagement: Vigo Bay allowed no room for the deployment of a battle line, so Rooke had to adapt his tactics to the exigencies of the situation. Rooke recorded in his journal: Upon consideration of the present position of Monsieur Château-Renault's squadron … and in regard the whole fleet cannot, without great hazard of being in a huddle, attempt them where they are: it is resolved to send in a detachment of fifteen English and ten Dutch ships of the line of battle with all the fireships, to use their best endeavours to take or destroy the aforesaid ships of the enemy … Breaking the boom Early in the morning on 23 October, Vice Admiral Thomas Hopsonn in the led the attack on the boom, closely followed by a strong squadron of his English ships, and of Dutch vessels under Vice Admiral Philips van der Goes. Near each end of the boom Château-Renault had moored two of his largest men-of-war: the Bourbon, and the Esperance. Within the boom he had moored five other large men-of-war with their broadsides bearing upon the entrance. Meanwhile, Ormonde with some 2,000 men, had landed on the shore near Teis