Movements in the vicinity of Fredericksburg — a flag of truce — Yankees reported moving.
Fredericksburg, Dec. 29.
--A Yankee encampment moved in sight since last night.
Some infantry and artillery firing has been heard in the direction of Dumfries.
A flag of truce came over to-day, but the result has not transpired.
There is a rumor this evening that a portion of the Yankees are moving away.
The trains are constantly arriving.