Abdur Rahman bin Yazid (may Allah have mercy on him) says: We set out with an army in which Sayyiduna Salman al-Farsi (may Allah be pleased with him) was also present. We besieged a fort and granted its people amnesty. Leaving behind a sick companion, we moved forward. Later, another army arrived, and not knowing about the amnesty, they took the fort by force and martyred the sick companion. When this news reached Sayyiduna Salman (may Allah be pleased with him), he ordered that the women and children be returned to the fort, and that the decision regarding the blood would be made by Sayyiduna Umar (may Allah be pleased with him).
Hadith Referenceسنن سعید بن منصور / كتاب الجهاد / 3779