Military conscription was reintroduced in Britain (Northern Ireland being exempted) in May 1939 in anticipation of World War II. A form of "industrial conscription" was also used to increase output in coal mining (see the "Bevin Boys") and other dimensions of the war effort. Later in the war both forms of conscription were extended in a limited way to women, such as the Women's Land Army to help with agricultural production. Conscientious objectors were treated more leniently than in WWI, but could still go to prison if they refused war-related work. For example, the scientist Kathleen Lonsdale was sentenced to a month in Holloway prison in 1943 for refusing to register for war duties and refusing to pay a resulting fine of two pounds.