This poster, commissioned by the Spanish Communist Party, reminds rural women of their importance in the war effort, and specifically that the food they grow in the fields supports their men in battle. The image portrays this message clearly. The woman smiling broadly holds up a tool of farming; her shadow is represented by a strong man dressed for battle with helmet and gun. Both the Republicans and Nationalists used the claim of having the best food as a propaganda message.
Source: Fergui. Communist propaganda poster for farm women. Posters of the Spanish Civil War. Southworth Collection. University of California at San Diego, http://orpheus.ucsd.edu/speccoll/visfront/newadd22.html