I want to know the answer to the following question:
On which date was the Battle of Gravelotte?
All the background I'm provided with is that "It was fought about 6 miles (9.7 km) west of Metz, where on the previous day, having intercepted the French army's retreat to the west at the Battle of Mars-La-Tour, the Prussians were now closing in to complete the destruction of the French forces.". Is that enough to answer the question?