It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) led the Salat al-Khawf (prayer of fear) in such a way that he made one group stand behind him and had them perform one bowing (ruku) and two prostrations (sujood), while the other group stood facing the enemy. Then the group that had prayed one rak’ah with the Prophet (peace and blessings be upon him) left, and the other group came. The Prophet (peace and blessings be upon him) had them also perform one bowing and two prostrations, and then the Prophet (peace and blessings be upon him) said the salam (ended the prayer). After that, every person from both groups stood up and completed one rak’ah with two prostrations by himself.