When the Prophet (blessings and peace of Allah be upon him) returned from the battle of the Trench, and laid down his weapon and did ghusl – as narrated by al-Bukhaari (4117) – Jibreel (peace be upon him) came to him and said: Have you laid down your arms? For by Allah, we (angels) have not laid down ours; go out to them. He said: “Where to?” He said: Over there – and he pointed in the direction of Banu Qurayzah. So the Prophet (blessings and peace of Allah be upon him) went out to them, and besieged them with detachments of Muslims for umpteen days. Allah cast fear into their hearts and the siege became intense, until they agreed to accept the ruling of Sa‘d ibn Mu‘aadh, as they had been his allies. His verdict concerning them was in accordance with the ruling of Allah: their fighters were to be killed and their women and children taken captive.