Final answer:
Numbers Chapter 3 does not have the defeat of any leader recounted by Moses. The book does mention Moses speaking of the defeat of the Amorite kings Sihon and Og in Numbers 21, which is not in Numbers 3. Moreover, Joshua, not Moses, led the military campaigns in Canaan.
Step-by-step explanation:
The student has asked about Moses recounting the defeat of a leader in Numbers 3. However, there seems to be a mix-up in the reference as Numbers Chapter 3 does not contain an account of Moses recounting the defeat of any leader – it mainly deals with the genealogy and duties of the Levites. Nonetheless, Numbers 21:21-35 does recount the defeat of two Amorite kings, Sihon and Og, which Moses recounts to the Israelites. These victories occurred as the Israelites journeyed towards Canaan, after their exodus from Egypt.
Moses's more widely known feats include demanding the release of the Hebrews from Pharaoh in Egypt, as well as receiving the Ten Commandments on Mt. Sinai, where he encountered idolatry among the Israelites in the form of a golden calf worship. Subsequently, Joshua, Moses's successor, led military campaigns in Canaan against its inhabitants, which include the notable victory against the walls of Jericho. (Joshua 6:1-27).