Final answer:
Trench warfare, a prominent tactic in World War I, was largely not found in World War II due to advancements in military technology and strategies that favored mobility.
Step-by-step explanation:
The tactic that would have been most likely found in World War I and not World War II is trench warfare. This method of warfare involved soldiers in both armies living and fighting from deep trenches to protect themselves from the enemy's gunfire. The emergence and extensive use of trench warfare during the Great War was primarily due to the power of machine guns, new long-range artillery, and other defensive technologies making offensive strategies extremely difficult and costly in terms of human lives. By contrast, in World War II, advances in military strategies and technologies, such as fast-moving tanks and air power, meant that static trench warfare was largely abandoned in favor of more mobile and fluid forms of combat.