The enemy on the Peninsula.
--The Yankees have appeared at the White House, on the Pamunkey river. Yesterday afternoon, as the train on the York River Railroad was about leaving there for Richmond, one of our cavalry pickets galloped up and warned them to hurry off, as the enemy was approaching. The train came off directly.Couriers who arrived in Richmond last night report that the enemy in force had driven in our pickets at Bottom's Bridge, eighteen miles from the city. They consisted of two cavalry regiments, and it is supposed of eight infantry regiments, as eight regimental flags were counted. At last accounts they were this side of Bottom's Bridge.
