Ayoub al-Sakhtiyani أيوب السختياني · The Book of the Fear Prayer

"The imam should stand up facing the Qiblah and some of them should stand with him while the others stand facing the enemy. Then he should pray one rak'ah with them and they should pray another rak'ah by themselves, and prostrate twice where they are. Then they should go to where the others are and the others should come and he should lead them in bowing once and prostrating twice, so it will be two rak'ahs for him and one…

The Messenger of Allah (ﷺ) led his companions in offering the fear prayer. One group prayed with him while the other was facing the enemy. He led them in praying two rak'ahs, then they went and took the place of the others, and the others came and he led them in praying two rak'ahs, then he said the taslim.