How did the great war alter time-honored military codes of conduct and dash hopes for a quick end to the war? what role did new technologies play in the process of changing the understanding of the war?

World War I completely changed the way wars were fought.

Trench warfare, which was the norm just a century ago was seen as an nonviable strategy.

Modern machines such as tanks and airplanes made trench warfare mostly about keeping ground and resulted in stalemates.

Also, it was the first time that modern tanks, planes and machine guns were being used for first time at such a large scale, resulting in an unprecedented level of death and carnage.

Military generals soon realized that time-honored military code of conducts were now obsolete and a completely new form of strategy was now required.