In Nahum 2, Nahum is prophesying a spiritual renewal -- the formation of a new church.
A 'church', in New Christian terminology, isn't a building for religious services, or a formal organization -- it's really better thought of as a state of belief, or the religious culture, of a group of people.
In the "church" in Nahum's day, in Judea, the religious culture had gotten hollowed out. People still followed the external rituals of worship, but many had lost sight of the internals -- they might avoid certain foods, or make prescribed sacrifices, but then not do the work of applying themselves to loving the Lord and the neighbor.
In Nahum 2:1-3, there's a prophecy of the Lord’s advent, and the development of a new church from Him, that he will protect. A mountain, here, means the Lord’s Divine Love. Feet mean the most external things, as is reflected in the Lord's taking on an earthly body in His advent.
In Nahum 2:3-6, it's talking about people who destroy the truths of the church in themselves and try to destroy them in others, to push away the Lord's protection.
In Nahum 2:7-10.... false ideas about life will prevail with people who destroy truths. All things that could be part of the church in them will ultimately be taken away.
In Nahum 2:11-13, it's saying that once all things of the church are taken away from a person, that person can no longer harm the church itself.
