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August 4 marks the 100th anniversary of the day Britain entered World War I, which lasted until Nov. 11, 1918. While centenary commemorations and religious services memorialize the soldiers lost over those four years of wartime, it's also important to remember the legacy of the women who stepped up to plate and made sure their societies continued to function while men were shipped off the front lines.

This shift in the labor force meant that an unprecedented number of women were now tackling skilled industrial and military jobs that had been typically reserved for men. For example, in the image above, a woman worker shapes a steel knee splint at the supply depot in the Kensington War Hospital.

Continue below for a look at many of the other jobs that women took up during the war.

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Members of the Women's Land Army feed lambs during a march through London.

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Women workers push loaded wheelbarrows in Coventry, England.

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Women's Army recruits during drill routines.

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Women work as porters at Marylebone Station in London while men are away at war.

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A woman munitions worker wears goggles while welding on her workbench in an armaments factory.

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Nurses set out to collect funds to help soldiers on the frontlines.

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The chief officer of the Women's Fire Brigade smiles for the camera.

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Women sort waste paper to be recycled.

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A portrait of a member of the women's Land Army carrying pails.

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A pair of workers smooth and polish lenses.

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A women worker leads a horse at Cross Farm in Shackleton, Surrey, England.

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A woman is hard at work in an armaments factory.

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A woman takes over as a dispatch rider during the war.

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American college students work as laborers on a farm as replacements for men who are serving as soldiers.

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Women of the Women's Royal Australian Naval Service wave flags on Armistice Day in London.