The prophet Nahum is seeing that God has plans to destroy Ninevah. He sees them trying to build up their army, but they just stumble. They are pillaged and ransacked; left for nothing. Why the animosity towards Ninevah? The passage calls them a "city of blood". They were murderers, committed evil with their hands and their hearts and showed no remorse. God does not like an unrepentant heart! Ninevah had fallen off track and God was going to punish them for their actions. I am not sure where Jonah comes in, but I'm sure he is sent to give Ninevah a warning to allow God to work in their hearts before destruction hits.
God is an angry jealous God, but He longs to show his people compassion. Most always get a warning beforehand and have to make their own choice as to where they will go from there.
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