Final answer:
Marquis De Lafayette employed guerilla warfare and diplomatic negotiations to contribute to the success of the American Revolution.
Step-by-step explanation:
The military strategies and tactics employed by Marquis De Lafayette to contribute to the success of the American Revolution included guerilla warfare and diplomatic negotiations.
Lafayette played a crucial role in organizing and leading guerilla warfare tactics, which involved small and swift surprise attacks on British forces. This strategy allowed the American revolutionaries to disrupt and weaken the British military presence.
In addition to guerilla warfare, Lafayette also utilized his diplomatic skills to gain support and resources from foreign nations, particularly France. He played a key role in securing aid from the French government, including military support and supplies, which significantly bolstered the American cause and contributed to the ultimate success of the Revolution.