Yesterday arrived a mail from Charles Town, South Carolina, which was brought by the Swallow packet, Capt. Copeland, by which there is advice from Charles Town, that a mob rose and seized the arms and gunpowder that were kept in a building adjoining to the Guard-house, in the middle of the town. There were only five barrels of powder seized, but the quantity of arms uncertain. The Deputy Governor has published a proclamation of 100 £. sterling for the discovery of the offenders, but no success had attended it when these accounts came away, which was on the 2d of May.