Leicestershire is one of the East Midland's smaller coalfields, though it was growing faster than any other coalfield in the two decades before the First World War, and its output, and number of persons employed, unlike those of many far larger coalfields, were greater in 1925 than they had been in 1913. Annual average earnings per shift were also among the highest in the country and the level of unemployment among the miners was relatively low by coal-mining standards. The Leicestershire Miners' Association had 7,428 members at the end of 1925, which represented about three-quarters of the coal-miners employed in the coalfield, and relations with the coal-owners were by tradition peaceful with the owners agreeing to assist the LMA's “closed shop” policy and allowing union business to be conducted on colliery premises. The Leicestershire coalfield was one of that select band of inland coalfields that enjoyed relative prosperity in the early 1920's, and this state of affairs was reflected in the fact that the owners did not lock their men out to enforce either reduced wages or increased hours in May 1926, but rather the miners struck in support of the policies of the Miners' Federation of Great Britain, to which they had been affiliated since its inception in 1889.