The most significant cause for this expansion was the army, specifically the use of new tactics and the reorganisation of the Byzantine army. The revival of the Byzantine economy was important as the increased trade and prosperity allowed greater taxation which could then be spent on the army for better weaponry and heavy Cavalry divisions. The revival of the economy is a contributing factor however it is subordinate to the army which was crucial. This is because the military success was stimulated to a greater degree by leadership and improved tactics rather than weaponry which was influenced by the revival of the economy. Without the introduction of new tactics and the reorganisation of the Byzantine army; the Byzantine Empire would not have been as successful in the expansion in the east. The decline and the splitting of the Abbasid Caliphate were contributing
The most significant cause for this expansion was the army, specifically the use of new tactics and the reorganisation of the Byzantine army. The revival of the Byzantine economy was important as the increased trade and prosperity allowed greater taxation which could then be spent on the army for better weaponry and heavy Cavalry divisions. The revival of the economy is a contributing factor however it is subordinate to the army which was crucial. This is because the military success was stimulated to a greater degree by leadership and improved tactics rather than weaponry which was influenced by the revival of the economy. Without the introduction of new tactics and the reorganisation of the Byzantine army; the Byzantine Empire would not have been as successful in the expansion in the east. The decline and the splitting of the Abbasid Caliphate were contributing