The Charlotte Bannon Papers consist primarily of a 259-page typescript of letters she wrote to family and friends from Paris between 1918 and 1921. There are also a few letters to Bannon from others that were probably enclosures in her letters home included in the typescript. Biographical material, one photograph of Bannon, one photograph of her friend Madame Laure, and photocopies of original photographs of Bannon in the Smith College Archives complete this small collection.

Charlotte Bannon's enthusiastic letters are full of descriptive detail and tell a story common to many of the Americans who went overseas during World War I to do war work. Motivated by the desire to serve their country, they were also looking for adventure and excitement. Even those stationed away from the front lines, as Bannon was, usually found it. Shortly after her arrival she complained that she had "prowled every night all over the Boulevards hoping for an air raid...but no such luck yet." Soon, however, she was writing of air raids, a constant stream of visitors to her pension, and the cosmopolitan soldiers and other war workers she encountered on a daily basis. Three months after her arrival she wrote that "the past week has been so full of thrills...I sometimes wonder how we'll ever get along without a war when peace comes." The emphasis of these letters is on Bannon's social life because, she writes, the task of describing the events which take place in her office, the Red Cross, and on the international scene is too overwhelming. Nevertheless, all of the above subjects appear in the letters on a regular basis. She had frequent contact with friends from home, including members of the Smith College Relief Unit stationed at Grecourt and other parts of France. These letters provide a very detailed picture of a three year period in a long life. The additional papers provide a small amount of information about her life before and after her Red Cross work in Paris, but do not provide a very complete context for those years.