«وَحُرُوبُ الْكُرُوبِ»
And wars of anguish came upon him.
Ḥurūb means wars, whereas kurūb means intense griefs or afflictions. The speaker need not be describing literal battles: he depicts repeated troubles as assaults.
The close sounds and altered consonants make the expression memorable. The sound pattern supports the idea: adversity seems to wage a sustained campaign against him rather than inflict a single passing injury.