To begin with, Leo moved to Apulia, and reached the Fortore River near the city of Civitate (or Civitella, northwest of Foggia).
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The Battle of Civitate (also known as Battle of Civitella del Fortore) was fought on 18 June 1053 in Southern Italy, between the Normans, led by the Count of Apulia Humphrey of Hauteville, and a Swabian-Italian-Lombard army, organised by Pope Leo IX and led on the battlefield by Gerard, Duke of Lorraine, and Rudolf, Prince of Benevento.
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Initially, substantial aid was refused and Leo returned to Rome in March 1053 with only 700 Swabian infantry.
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Werner was originally a Swabian count who was sent as captain of the German contingent of 700 infantry and cavalry by the Emperor Henry III to assist Pope Leo IX at the Battle of Civitate.