Sayyiduna Sahl bin Abi Hathmah (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) led his Companions in the fear prayer and arranged them behind him in two rows. He led the row that was with him (peace and blessings be upon him) in one rak'ah. Then he (peace and blessings be upon him) remained standing until they had prayed one rak'ah. Then those behind came forward and the first row went back. Then the Prophet (peace and blessings be upon him) led them in one rak'ah. Then he (peace and blessings be upon him) sat until those behind had prayed one rak'ah. Then he (peace and blessings be upon him) gave the salam with them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6011