Nor were the subtler methods of sabotage forgotten in these demonstrations. From many places came reports of emery dust in the gearings of expensive machines. Men boasted of powdered soap emptied into water tanks that fed boilers, of kerosene applied to belting, of railroad switches that had been tampered with. With these and many similar examples before them, the public became convinced that the mere arresting of a few leaders was futile. A mass meeting at Ipswich, Massachusetts, in 1913, declared, as its principle of action, "We have got to meet force with force," and then threatened to run the entire local I. W. W. group out of town. In many towns vigilance committees acted as eyes, ears, and hands for the community. When the community refused to remain neutral, the contest assumed a different aspect and easily became a feud between a small group of militants and the general public. In the West this contest assumed its most aggressive form. At Spokane, in 1910, the jail was soon filled, and sixty prisoners went on a hunger strike which cost several lives. In the lumber mills of Aberdeen, South Dakota, explosions and riots occurred. In Hoquiam, Washington, a twelve-foot stockade surmounted by barbed wire entanglements failed to protect the mills from the assaults of strikers. At Gray's Harbor, Washington, a citizens' committee cut the electric light wires to darken the meeting place of the I. W. W. and then used axe handles and wagon spokes to drive the members out of town. At Everett, Washington, a strike in the shingle mills led to the expulsion of the I. W. W. The leaders then called for volunteers to invade Everett, and several hundred members sailed from Seattle. They were met at the dock, however, by a large committee of citizens and were informed by the sheriff that they would not be allowed to land. After some parley, the invaders opened fire, and in the course of the shooting that followed the sheriff was seriously wounded, five persons were killed, and many were injured. The boat and its small invading army then returned to Seattle without making a landing at Everett.