How did most men die in world war 1?

Most men died in World War I due to a combination of brutal trench warfare, which led to high casualties from direct combat, artillery bombardments, and poison gas attacks. Additionally, diseases and injuries from the harsh conditions in the trenches contributed significantly to the death toll. The war's scale and technological advancements in weaponry resulted in unprecedented levels of violence and loss of life. Ultimately, an estimated 9 million soldiers lost their lives during the conflict.