The attitude of the Administration at Washington was a source of great encouragement to Sheriff Jones and his associates, who were anxious to wreak their vengeance on the city of Lawrence for the outcome of the Wakarusa War. Jones came to Lawrence apparently for the express purpose of picking a quarrel, for he revived the old dispute about the rescuing party of the previous fall. As a consequence one enraged opponent slapped him in the face, and at last an unknown assassin entered the sheriff's tent by night and inflicted a revolver wound in his back. Though the citizens of Lawrence were greatly chagrined at this event and offered a reward for the discovery of the assailant, the attack upon the sheriff was made the signal for drastic procedure against the town of Lawrence. A grand jury found indictments for treason against Reeder, Robinson, and other leading citizens of the town. The United States marshal gave notice that he expected resistance in making arrests and called upon all law-abiding citizens of the Territory to aid in executing the law. It was a welcome summons to the pro-slavery forces. Not only local militia companies responded but also Buford's company and various companies from Missouri, in all more than seven hundred men, with two cannon. It had always been the set purpose of the free-state men not to resist federal authority by force, unless as a last resort, and they had no intention of opposing the marshal in making arrests. He performed his duty without hindrance and then placed the armed troops under the command of Sheriff Jones, who proceeded first to destroy the printing-press of the town of Lawrence. Then, against the protest of the marshal and Colonel Buford, the vindictive sheriff trained his guns upon the new hotel which was the pride of the city; the ruin of the building was made complete by fire, while a drunken mob pillaged the town. On May 22, 1856, the day following the attack upon Lawrence, Charles Sumner was struck down in the United States Senate on account of a speech made in defense of the rights of Kansas settlers. The two events, which were reported at the same time in the daily press, furnished the key-note to the presidential campaign of that year, for nominating conventions followed in a few days and "bleeding Kansas" was the all-absorbing issue. In spite of the destruction of property in Lawrence and the arrest of the leaders of the free-state party, Kansas had not been plunged into a state of civil war. The free-state party had fired no hostile shot. Governor Robinson and his associates still relied upon public opinion and they accepted the wanton attack upon Lawrence as the best assurance that they would yet win their cause by legal means.