Battle of Somme - 800 thousand French and 540 thousand German soldiers (total: 1 million 340 thousand)
At the battle of Verdun - 150 thousand French and 150 thousand German soldiers (Approximately, total of 300 thousand)
Battle of Ypres: 100 000 French and 10 000 German casualties.
Total for all battles: 1 million and 700 thousand