...ks Monday, and made other preparations for a regular siege. About half-past 11 o'clock on Monday night, the citizens of Petersburg were startled by several heavy discharges of musketry in Chesterfield county , the sound proceeding from a point due north of Petersburg.-- Anxiety was on tip-toe to ascertain the cause but it was not ascertained until nearly four o'clock, just before the dawn of day. At tha...