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The battle opened with an attack by 150 light cavalrymen from the Abbey of Saint-Médard de Soissons against the Flemish knights on the allied left , aiming to throw it into confusion .
 Abbey of Saint-Médard de Soissons
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Abbey of Saint-Médard de Soissons