In the expectation of a siege, the castle garrison was increased to around 800 soldiers; the avenue of trees outside the castle gates were cut down, and neighbouring buildings destroyed to avoid them being used by Parliamentary forces. Large amounts of food were brought in to support the growing castle community, which also included a number of the wider Herbert family and other regional Royalist leaders who had sought shelter there. The first Parliamentary army arrived in early June, under the command of Colonel Morgan and Sir Trevor Williams. After several calls for the castle to surrender, a siege ensued, lasting through the summer months. In August, additional Parliamentary forces under General Fairfax arrived, and calls for the castle to surrender were renewed. Fairfax's men began to dig trenches towards the castle, and used these to move mortars forward, probably including the famous "Roaring Meg", bringing the interior of the castle into artillery range. Facing a hopeless situation, the Marquess surrendered the castle on 19 August on relatively generous terms for the garrison. The Marquess himself was arrested and sent to Windsor Castle, where he died shortly afterwards. Informed shortly before his death that Parliament had granted his request to be buried in the family vault at Windsor, the Marquess remarked; "Why then I shall have a better castle when I am dead, than they took from me when alive."