The indirect approach was a military strategy described and chronicled by B. H. Liddell Hart after World War I, was Liddell Hart's attempt to find a solution to the problem of high casualty rates in conflict zones with high force to space ratios, such as the Western Front on which he served. The strategy calls for armies to advance along the line of least resistance. It is best described in this quote from his papers referring to the theory. There were two fundamental principles which governed the indirect approach.