From the North.
Mobile, August 14.
--A special dispatch to the Tribune, date Grenade, 13th instant, says the St. Louis Republican, of the 7th instant, says that the guerrillas continue their vigorous warfare in Missouri.
They seem to be crossing to the north side of the Missouri river.
On the 4th instant, they attacked and dispersed a body of Federal troops at Taylorsville.
Colonel Poindexter is reported near Hudson, with 1,200 partisans, threatening to capture that place.
A dispatch from Shelban, reports Porter, with 2,400 men, encamped near Newark.
He had bagged two companies of militia there, after slight resistance, with a large number of horses, guns, and a considerable amount of ammunition.
Up to the 8th instant, 22,000 men were enrolled in the State of New York.
Important army movements are anticipated at Washington.
No one is allowed to pass McClellan's lines.
A large number of negroes have been stolen by Pope, near Stenardsville, Va.
The New York Commercial states that an important secret expedition, consisting of one steamer' with a picked crew, had left a Federal port, and would soon be heard of.
It is announced that the Federal Government has contracted for another iron-clad Monitor, which will cost a million and a quarter of dollars. 