What was the costliest battle in WWI?

World War 1 was shocking in its cost of human life. Below are some of the costliest, in terms of casualties (killed, wounded, missing or captured) operations of the war. Numbers are rounded; sources disagree on exact totals. First Battle of the Marne, Sept 6–10, 1914. read more

Both sides suffered heavy casualties and began digging the trenches that would define warfare in the Great War. Allied casualties: 263,000 German casualties: Estimated to be about the same as Allied. Battles of Tannenberg and Masurian Lakes, Aug–Sept, 1914 In August, a German army encircled Russia’s Second Army near Tannenburg, East Prussia. read more

If one takes into account the duration of the fighting, then the battle of the Marne in Sep 1914 certainly ranks as one of the bloodiest of the first World War, or any conflict for that matter. At the Marne, the French lost about 250.000 casualties in all, with about 80.000 killed. The German casualties were about the same. read more

The total number of military and civilian casualties in World War I was more than 37 million. Here are the top 10 deadliest battles of WWI. read more