Logistics is the management of the flow of resources between the point of origin and the point of consumption to meet requirements. It involves integrating information, material handling, production, and transportation. Logistics has military origins in maintaining army supply lines and disrupting enemies'. The earliest logistics systems were developed by Alexander the Great to supply his cavalry and infantry armies. The Byzantine Empire further advanced logistics as a key part of war. Modern logistics principles were established during World War II when massive international supply chains were coordinated to enable the Allied victory through efficient transportation of vast amounts of supplies.