Massena retired on the 10th across the Agueda, and was relieved in his command by Marmont. The fate of Almeida was then decided, yet its brave governor, Brennier, who had been exchanged after the battle of Vimiero, carried off the garrison. He had fifteen hundred men and during the battle had skirmished boldly with the blockading force, while loud explosions, supposed to be signals, were frequent in the place. When all hope of succour vanished, a French soldier, named Tillet, penetrated in uniform through the posts of blockade, carrying an order to evacuate the fortress and rejoin the army by Barba de Puerco. Meanwhile the British general, placing the light division in its old position on the Azava with cavalry-posts on the Lower Agueda, had desired Sir William Erskine to send the 4th Regiment to Barba de Puerco, and directed General Alexander Campbell to continue the blockade with the sixth division and Pack’s brigade. Campbell’s dispositions were negligently made and negligently executed. Erskine transmitted no orders to the 4th Regiment, and Brennier resolved to force his way through the blockading troops. An open country and a double line of posts greatly enhanced the difficulty of the enterprise, yet he was resolute not only to cut his own passage but to render the fortress useless. In this view he had mined the principal bastions, and destroyed his guns by a singular expedient, firing several at the same moment with heavy charges but placing the muzzles of all but one against the sides of the others; thus while some shots flew towards the besiegers others destroyed the pieces without attracting notice: these were the explosions supposed to be signals.