It is narrated from Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him) that he said: "Before the rout and defeat of the polytheists, while the people were fighting each other, I saw something like a black cloak coming down from the sky, which looked like black ants (in its multitude). I had no doubt at all that they were the angels, and immediately after that the enemy suffered a crushing defeat."
Its chain is hasan (good), provided that Ishaq bin Yasar heard it directly from Sayyiduna Jubayr (may Allah be pleased with him).
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب السيرة والمغازي / 4249
Hadith Gradingمحدثین:إسناده حسن
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: إِسْنَادُهُ حَسَنٌ إِنْ كَانَ إِسْحَاقُ بْنُ يَسَارٍ سَمِعَهُ مِنْ جُبَيْرٍ . » «انفرد به المصنف من هذا الطريق»