وَأَرْسَلَ عَلَيْهِمْ طَيْرًا أَبَابِيلَ
Describes the birds (Ababil) Allah sent against Abraha's army.
تَرْمِيهِمْ بِحِجَارَةٍ مِنْ سِجِّيلٍ
Describes the stones of baked clay (sijjil) the birds bombarded Abraha's army with.