The Lord miraculously stops an army
Genesis 13:23-28
the Egyptians are drowned in the Red Sea
Mosiah 24:23
the Lord stops the Lamanites in a valley that they can no longer pursue Alma's people. The method is not given.
Old Testament
Assyrians (?) hear a noise and are scattered
A prophet opens the eyes of his servant, "those that are with us are more"
The righteous are protected from wars
Jarom 1:9
the Lamanites did not prosper against the Nephites