It is narrated from Abu Ubaydah that Abdullah (may Allah be pleased with him) said: "The polytheists kept the Prophet (peace and blessings be upon him) occupied from four prayers on the Day of the Trench until a large part of the night had passed. Then he (peace and blessings be upon him) ordered Bilal (may Allah be pleased with him), and he gave the adhan and the iqamah. He (peace and blessings be upon him) led the Zuhr prayer; then he gave the iqamah and he (peace and blessings be upon him) led the Asr prayer; then he gave the iqamah and he (peace and blessings be upon him) led the Maghrib prayer; then he gave the iqamah and he (peace and blessings be upon him) led the Isha prayer."
Hisham al-Dastuwa'i narrated it from Abu al-Zubayr, and there was disagreement over him regarding the adhan: some preserved it from him and some did not. Imam al-Awza'i (may Allah have mercy on him) narrates from Abu al-Zubayr that the prayers were offered one after another, with an iqamah for each.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1892