Final answer:
In the Prelude, self-defense changed in a fundamental way due to technological advancements and the nature of warfare. The old ideals of chivalric combat became obsolete, as new technology made skill and bravery irrelevant. Survival became the most important factor, highlighting the role of luck in self-defense.
Step-by-step explanation:
In the Prelude, self-defense changed in a fundamental way as a result of technological advancements and the changing nature of warfare.
Prior to this time, self-defense often involved hand-to-hand combat, where individuals could display their skills and bravery. However, with the advent of new technology like artillery shells and mechanized warfare, the old ideals of chivalric combat became obsolete. It became clear that no amount of skill or bravery could protect soldiers from the arbitrary nature of death on the battlefield.
This fundamental change in self-defense highlighted the importance of survival and the role luck played in determining one's fate.