Muhajir bin Dinar narrates: Sayyidah Asma' bint Yazid bin al-Sakan (may Allah be pleased with her), who was the cousin of Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him), killed nine Romans with a tent pole on the day of the Battle of Yarmuk.
Al-Tabarani recorded it, and its narrators are thiqat (trustworthy).