The storyline of "The War Romance of the Salvation Army" is based on a life of Commander Evangeline Booth, who has been the source, the inspiration, the guide of this story. The book is a great account of the many lives that the Salvation Army lassies touched and led to the Lord. Unlike the most of Grace Livingston Hill's book this one does not have a romantic plot and rather is focused on a relationship between the U.S. Army and the Salvation Army during WWI.

Grace Livingston Hill was an early 20th-century novelist and wrote both under her real name and the pseudonym Marcia Macdonald. She wrote over 100 novels and numerous short stories and her characters are most often young female Christian women or those who become so within the confines of the story. Hill's messages are simple in nature: good versus evil. As Hill believed that the Bible was very clear about what was good and evil in life and had firm faith God's ability to restore everything, the same belief was also reflected in her own works. Even today Hill's novels are widely read and appreciated for their romance and their inspiring life lessons.