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How did Leo III’s military victories affect the Byzantine army?

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Leo III’s military victories significantly bolstered the Byzantine army and strengthened the state. His successes, particularly the defense of Constantinople and the victory at Akroïnos, improved army morale and earned him great popularity among his soldiers.1

To address the risk of military coups, Leo III reorganized the army by subdividing several of the largest military-district armies, or themes. These units had previously become so powerful that their commanders were tempted to seize the throne; by breaking them into smaller, more manageable districts, Leo succeeded in reducing the throne's vulnerability to military overthrow.1

As an energetic soldier-emperor who personally led his troops in battle, Leo demonstrated a consistent concern for the efficiency of his forces. By the time of his death, he had transformed the army into a more effective instrument than it had been at the start of his reign.1