The defeat of Montaperti, by Niccolo di Giovanni Ventura, 1443

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The Battle of Montaperti was fought on September 4, 1260, between Florence and Siena in Tuscany as part of the conflict between the Guelphs and Ghibellines.
La sconfitta di Montaperti - The defeat of Montaperti, by Niccolo di Giovanni Ventura, 1443 (http://warfare.gq/15/Niccolo_di_Giovanni_Ventura-1443.htm) is illustrated with soldiers in 15th century costume.
p9, Florentine mounted knights with standards and trumpeter (http://warfare.gq/15/Niccolo_di_Giovanni_Ventura-p9.htm)
p18, armoured infantry, tumpeter, oval shield (http://warfare.gq/15/Niccolo_di_Giovanni_Ventura-p18.htm)
p21, Sienese mounted knights with banner and trumpeter (http://warfare.gq/15/Niccolo_di_Giovanni_Ventura-p21.htm)
p23, mounted knights, infantry and camp (http://warfare.gq/15/Niccolo_di_Giovanni_Ventura-p23.htm)
https://forums.totalwar.org/vb/attachment.php?attachmentid=19726&d=1499755708

MIRROR SITE
15th century Italian soldiers in La sconfitta di Montaperti - The defeat of Montaperti, by Niccolo di Giovanni Ventura, 1443 (http://warfare2.000webhostapp.com/15/Niccolo_di_Giovanni_Ventura-1443.htm)

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15th Century Illustrations of Costume & Soldiers (http://warfare.gq/15C.htm)

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The banner carried by the Sienese is probably that of Saint Martin who cut his cloak in half to give to a beggar. (http://warfare.gq/15/Niccolo_di_Giovanni_Ventura-p21.htm)

https://upload.wikimedia.org/wikipedia/commons/thumb/4/46/Siena-Stemma.png/100px-Siena-Stemma.png
The coat of arms of Siena.

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Saint_Martin_-_Duomo_Lucca_Italia.jpg/240px-Saint_Martin_-_Duomo_Lucca_Italia.jpg
San Martino - Duomo di Lucca

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Illustrations of Costume & Soldiers (http://warfare.gq/index.htm)