What does Daniel 11:41 mean?

Daniel has been describing a figure who will arise in the very end times before God's final judgment (Daniel 11:36–39). That figure will be attacked from the south and north (Daniel 11:40). Many Bible interpreters believe this corresponds to Ezekiel's prophecy of a large coalition from the north launching itself at Israel (Ezekiel 38:4, 11–15). Similar descriptions are found in the book of Joel (Joel 2:2, 20). Israel would be attacked, in this case, because of its treaty (Daniel 9:27) with this king's allies.

"The glorious land" is Israel. The leader of invading northern armies will bring widespread death and mayhem. However, some will be spared. It's unclear if the description of those "delivered" is a reference to people groups or to territories.

The groups mentioned here were historic and bitter enemies of Israel. The Ammonites and Moabites (Genesis 19:36–38) were hostile toward Israel during Israel's trek through the wilderness (Deuteronomy 23:3–4). The king of Moab once enlisted Ammonites and Amalekites to battle Israel (Judges 3:12–13). Second Samuel 10 reports an occasion when the Ammonites hired a Syrian army to battle the forces of King David. When Nehemiah and his workers were rebuilding Jerusalem's walls, they were opposed by hostile Gentile neighbors, including Tobiah the Ammonite (Nehemiah 4:3). As those people groups no longer hold territory, this part of Daniel's text may prophesy that those living in or around Israel who join with the northern forces will be accepted.

An alternative view is that these are references to geography, not ethnicity or culture. That would suggest that the northern invaders are selective in their attack. As of this writing, the modern nation of Israel does not include territories historically associated with Ammon, Moab, and Edom. Those are part of other nations; this prophecy may be noting that this is an attack on Israel, not neighbor states, or that those territories will ally with the north in this attack.