question #3 Sahih al-Bukhari 4133, Book 64, Hadith 177 : How does the Prophet Muhammad (ﷺ) adapt the prayer ritual in situations of danger or conflict?

Allah’s Messenger (ﷺ) led the Fear-prayer with one of the two batches of the army while the other (batch)
faced the enemy. Then the first batch went away and took places of their companions (i.e. second
batch) and the second batch came and he led his second rak`a with them. Then he (i.e. the Prophet:
finished his prayer with Taslim and then each of the two batches got up and completed their remaining
one rak`a.