In Byzantium, the successor in law of the Roman Empire, the official expenditure military (Logothetis) should ensure that the population maintains the army and put him
available to districts in this part of direct charges. A train consisting of servants and slaves accompanied the fighting troops and will assemble tents, fortifications and supplies.
In addition, the Army had troop health well-organized. The garrisons had very important
baths for the soldiers. The continuing threat of war made Byzantium the only place in the Middle Age where people carefully studied the methods of warfare (strategic and tactical) of the organization of the Army, fortifications and technical principles of supply.
In his book entitled « Tactics », written in Greek, Byzantine Emperor Leo VI (886 —
912) site logistics at the forefront of the Arts ( « technai ») of the war, along
the strategy (conduct of the army) and tactical (combat device), armaments and
fortifications, astronomy, Orthodoxy and the health service.
The « logistik techne – art of calculation which resembles a real war statistics. It what used for the articulation and support troops, regularing the duration of campaigns, driven in particular by the support and rest phases of the army.
Logistics was responsible for lead the army and equip it with weapons, parts and equipment war. Moreover, it was to prepare for each phase of the campaign, so
estimate the time and space to appreciate the ground for defensive positions and
fortifications, but also in relation to troop movements and to assess the strength of
The movements and the articulation of own armed forces were ordered on that basis.
According to Leon, logistics, based on logic and mathematics, would help the army to be ready in timeswar and fulfill the tasks related to the field of movements and neighborhoods and support the strategy and tactics.
This interpretation of sustainable logistics influenced the subsequent military authors.