One of the best examples of a war of attrition is World War I on the Italian and Western Fronts. Both sides were drained until one side did not have enough men, horses, food and other military resources to continue. The term was often used to show a lack of imagination in simply throwing soldiers at their enemy. While this implies attrition warfare can be avoided, unfortunately it often cannot. Attrition is frequently a key approach to winning a war. An army will use maneuver and position to its advantage so that when the fight does occur the enemy suffers the greater loss of resources. But attrition may be necessary to create the space in which to maneuver and position forces. For this reason, the two approaches to fighting a war are closely linked and attrition is often the more important. The end of World War I is described in detail by Keegan. It is enough to say that Germany could not replace the men killed with equal numbers of new troops.