From the LCMS website:
Joshua, the son of Nun, of the tribe of Ephraim, is first mentioned in Exodus 17 when he was chosen by Moses to fight the Amalakites, whom he defeated in a brilliant military victory. He was placed in charge of the Tent of Meeting (Ex. 33:11) and was a member of the tribal representatives sent to survey the land of Canaan (Num 13:8). Later, he was appointed by God to succeed Moses as Israel’s commander-in- chief. He eventually led the Israelites across the Jordan River into the Promised Land and directed the Israelites’ capture of Jericho. He is remembered especially for his final address to the Israelites, in which he challenged them to serve God faithfully (Josh 24:1–27), concluding with the memorable words, “As for me and my household, we will serve the Lord”(24:15).