Hadith.1346 - Ubaydullah ibn Ali Al-Halabi reported from Imam Jafar ibn Muhammad Al-Sadiq (as) who said
"The prayer during advancing combat (al-zahf) is performed on one's back with gestures of the head and the takbir (proclamation of 'Allahu Akbar'). During close fighting (al-musayafa), it involves takbir without gestures. During pursuit (al-mutarada), it is performed with gestures, and each person prays individually as per their situation."