From Norfolk.
a Lage ship going to Newport News--over twenty sail in Hampton Roads, &c.[special correspondence of the Dispatch.]
Norfolk, Oct. 18, 1861, 1 o'clock, P. M.
A four-masted ship, supposed to be the Great Republic, is being towed up towards Newport News.
A large three-masted steamer is now coming into the Roads.
Over twenty sail of the enemy are in Hampton Roads to-day.
The lower station reports them buoying off the channel towards Newport News.