Final answer:
The Battle of Borodino occurred on September 7, 1812 during the Napoleonic Wars, resulting in heavy casualties for both the French and Russian forces.
Step-by-step explanation:
The Battle of Borodino took place on September 7, 1812 during the Napoleonic Wars. It was a major battle between the French forces led by Napoleon and the Russian forces. Both sides suffered heavy casualties, with approximately 70,000 soldiers killed or wounded.