It is as if I am looking at the dust rising in the alleyway of Banu Ghanm from the marching of Jibrīl's parade when the Messenger of Allah (may Allah’s peace and blessings be upon him) set out to Banu Qurayzhah

Anas ibn Mālik (may Allah be pleased with him) informs in this Hadīth that he saw the dust rising in the alleyway of Banu Ghanm, which was a local area of Al-Khazraj, due to the marching of the angel soldiers led by Jibrīl (peace be upon all of them), as they proceeded along with the Messenger of Allah (may Allah’s peace and blessings be upon him) to fight against Banu Qurayzhah.
The fact that Anas saw the traces of the angels does not necessarily mean that he saw the angels themselves. He might have seen them and might not. He, undoubtedly, knew this piece of information – that this was a regiment led by Jibrīl – from the Prophet (may Allah’s peace and blessings be upon him).