Lotta Svärd was a Finnish voluntary auxiliary paramilitary organisation for women. Formed originally in 1918, it had a large membership undertaking volunteer social work in the 1920s and 1930s. During the Second World War, it mobilized to replace men conscripted into the army. It served in hospitals, at air raid warning positions, and other auxiliary tasks in close cooperation with the army. The women were officially unarmed except for an antiaircraft battery in 1944. Virtanen argues that, their "accountability to the nation took a masculine and military form in public, but had a private, feminine side to it including features like caring, helping and loving." The organisation was suppressed by the government after the war.
The name comes from a poem by Johan Ludvig Runeberg. Part of a large and famous book, The Tales of Ensign Stål, the poem described a fictional woman named Lotta Svärd. According to the poem, a Finnish soldier, private Svärd - Swedish: svärd means a sword - went to fight in the Finnish War and took his wife, Lotta, along with him. Private Svärd was killed in battle, but his wife remained on the battlefield, taking care of wounded soldiers. The name was first brought up by Marshal Mannerheim in a speech given on 16 May 1918.
During the Finnish Civil War it was associated with the White Guard. After the war Lotta Svärd was founded as a separate organisation on 9 September 1920. The first known organisation to use the name Lotta Svärd was the Lotta Svärd of Riihimäki, founded on 11 November 1918.
The organisation expanded during the 1920s and it included 60,000 members in 1930. By 1944 it included 242,000 volunteers, the largest voluntary auxiliary organisation in the world, while the total population of Finland was less than four million.
During the 1920s and 1930s only Christian Finnish citizens were eligible to join, and two references from persons considered reliable were required. The latter requirement was often ignored after the break of Winter War in 1939. Foreigners could be accepted by special permission. However, in 1940 the first Muslim and Jewish members were accepted, and the first non-denominational member in 1941.