Every night they stole into their camp, murdered officers in their tents, carried off horses, slew sentries, and kept the enemy in a perpetual state of watchfulness.
At eight o'clock on the morning of the 15th of April the besiegers made a furious attack on the western outwork of Montjuich, having ascertained that it was defended only by a party of one of the newly raised Spanish regiments.

They captured the post without difficulty, the Spaniards flying at the first assault, but on the inner ramparts they were met by Donegal and his grenadiers, and a desperate struggle took place which lasted for two hours.
The English fought with the greatest obstinacy, and frequently flung back among their assailants the grenades which the latter showered among them, before they had time to explode, Lord Donegal himself setting the men the example.

But though able to prevent the French from advancing further, the English could not recover the outpost which the Spaniards had abandoned, and the French formed intrenchments and mounted a battery upon it.
In spite of the continued fire which the besiegers now poured in upon it from all sides, Lord Donegal held out bravely.

The little force under his command was much reduced in numbers, and so worn out by constant exertion and loss of sleep that men frequently fell asleep while under arms under the heaviest fire.

The besiegers were not idle in other directions.