The National Women’s History Museum has an online exhibit on women’s roles during World War I. The exhibit includes a small gallery of photos of women building machine guns and so forth.
Here’s the link:
http://www.nwhm.org/online-exhibits/progressiveera/womenworkingworldwarI.html
Here’s a collection of links:
http://www.firstworldwar.com/features/womenww1_seven.htm
And here they are, chopping down trees, among other things.
http://www.youtube.com/watch?v=XonhwLrAUVs
Would you have the courage to hammer on an artillery shell that way?