He saves my soul; he protects me in the battles that I wage. For a crowd is going against me.
The author is assured that God will help him, also when many people turn against him. Now, he does not speak about just one opponent. Perhaps his former friend was able to recruit many more people to attack the author. Being arrayed
sounds like being lined up, as in an army.
19 Il me délivrera de leur approche et me rendra la paix,Car ils sont nombreux contre moi.