A friend in north-western Arkansas writes to us the particulars of some of the atrocious acts committed by the federals there. Two of them seized two young girls and outraged them. Afterwards, two negroes, after severe struggling committed rapes on two respectable ladies, while their white comrades in arms stood by laughing at the shrieks and prayers of the poor women. May God nerve the arm of Gen. Cabell, and give strength to the brave men under him, to avenge the foul deeds of these dastardly ruffians.