فَهَدَاهُمْ بِالْأَسْوَدَيْنِ وَأَمْرُ اللَّهِ بَلَغَ تَشْقَى بِهِ الْأَشْقِيَاءُ
Meaning: He led them, provisioning them with the “two dark things”—dates and water—and the poet adds that the decree of God is fulfilled, bringing misery to the ill-fated.
The idiom al-aswadān here refers to dates and water, not two black flags or horses. Hadāhum conveys leading the group, with the commentary discussing provisions for its march.
Amru Allāhi balagha frames the outcome as destiny in the poet’s telling. It belongs to the poetic interpretation of this episode, not a basis for making sweeping religious judgments about all conflicts.