These proceedings, however, have lately suffered a most tragical interruption. Not long after Bridge's house was pulled down, two men, mounted and carrying rifles, called at the dwelling of a Mr Campbell, living at Whiterock Grove, in Ogle county, who belonged to the company of regulators, and who had acted as the messenger to convey to Bridge the order to leave the county. Meeting Mrs. Campbell without the house, they told her that they wished to speak to her husband. Campbell made his appearance at the door and immediately both the men fired. He fell mortally wounded and lived but a few minutes. "You have killed my husband," said Mrs. Campbell to one of the murderers whose name was Driscoll. Upon this they rode off at full speed. As soon as the event was known the whole country was roused, and every man who was not an associate of the horse-thieves, shouldered his rifle to go in pursuit of the murderers. They apprehended the father of Driscoll, a man nearly seventy years of age, and one of his sons, William Driscoll, the former a reputed horse-thief, and the latter, a man who had hitherto borne a tolerably fair character, and subjected them to a separate examination. The father was wary in his answers, and put on the appearance of perfect innocence, but William Driscoll was greatly agitated, and confessed that he, with his father and others, had planned the murder of Campbell, and that David Driscoll, his brother, together with another associate, was employed to execute it. The father and son were then sentenced to death; they were bound and made to kneel; about fifty men took aim at each, and, in three hours from the time they were taken, they were dead men. A pit was dug on the spot where they fell, in the midst of a prairie near their dwelling; their corpses, pierced with bullet-holes in every part, were thrown in, and the earth was heaped over them. The pursuit of David Driscoll and the fellow who was with him when Campbell was killed, is still going on with great activity. More than a hundred men are traversing the country in different directions, determined that no lurking-place shall hide them. In the mean time various persons who have the reputation of being confederates of horse-thieves, not only in Ogle county, but in the adjoining ones, even in this, have received notice from the regulators that they cannot be allowed to remain in this part of the state. Several suspicious-looking men, supposed to be fugitives from Ogle county, have been seen, within a few days past, lurking in the woods not far from this place. One of them who was seen the day before yesterday evidently thought himself pursued and slunk from sight; he was followed, but escaped in the thickets leaving a bundle of clothing behind him. Samonok, Kane County, Illinois, _July 5th._ I have just heard that another of the Driscolls has been shot by the regulators. Whether it was David, who fired at Campbell, or one of his brothers, I can not learn. Letter IX.