The strikers did not content themselves with mere picketing, but actually took possession of the railroad property and by a systematic "killing" of engines, that is removing some indispensable part, effectively stopped all the freight traffic. The number of men actively on strike was in the neighborhood of 9000, including practically all of the shopmen, yardmen, and section gangs. The engineers, firemen, brakemen, and conductors took no active part and had to be forced to leave their posts under threats from the strikers. The leader, one Martin Irons, accurately represented the feelings of the strikers. Personally honest and probably well-meaning, his attitude was overbearing and tyrannical. With him as with those who followed him, a strike was not a more or less drastic means of forcing a better labor contract, but necessarily assumed the aspect of a crusade against capital. Hence all compromise and any policy of give and take were excluded. Negotiations were conducted by Jay Gould and Powderly to submit the dispute to arbitration, but they failed and, after two months of sporadic violence, the strike spent itself and came to an end. It left, however, a profound impression upon the public mind, second only to the impression made by the great railway strike of 1877; and a Congressional committee was appointed to investigate the whole matter. The disputes during the second half of 1886 ended, for the most part, disastrously to labor. The number of men involved in six months, was estimated at 97,300. Of these, about 75,300 were in nine great lockouts, of whom 54,000 suffered defeat at the hands of associated employers. The most important lockouts were against 15,000 laundry workers at Troy, New York, in June; against 20,000 Chicago packing house workers; and against 20,000 knitters at Cohoes, New York, both in October.