What are three cities that were strategic battle sites in the hundred years' war?

Normandy

Orleans

Bordeaux

Explanation:

Normandy: When normandy was conquered by England they took a superior advantage in the war.

Orleans: When French siege Orleans and won they have a boost of reconquering the lost territpry

Bordeaux: When French won in Bordeaux they finally won the war.

the crusaders are identified in the painting;

c. by the red crosses on their backs

because it took place after the war of 1812 had come to an end.