sentences:  The progress of the Royalist mines closer towards the walls, quickened by the arrival of Welsh miners on 29 August, led Massey to believe an assault was imminent.On 1 September he fortified Friars Orchard with an earthwork wall and sconce, a fort in which he placed four pieces of artillery that could be brought to bear on any Royalists who broke through the south-east corner or the east gate.On 3 September the Parliamentarians placed a saker in a gun port they had been secretly building in east wall above the gallery protecting the Royalist miners.