How many died at the battle of marne?

The First Battle of the Marne, fought from September 6 to September 12, 1914, resulted in significant casualties for both sides. Approximately 2.5 million men were engaged in the battle, with total casualties estimated to be around 500,000, including killed, wounded, and missing soldiers. The battle marked a crucial turning point in World War I, halting the German advance into France.