Quran Ayat regarding Salat at the time of War

102. And (O Beloved Prophet) when you are among them, then lead them in prayer [320], then let a group of them be with you [in prayer] [321] and let them take their arms [in defense] [322]. When they have finished their prostrations [323], let them be [in position] going to the rear [324]. Then let the other group, which has not yet prayed [325] come and be your follower [326] in the prayer and let them also take their means of protection and their weapons. The infidels wish that you become negligent of your arms and your baggage so that they can come down upon you in one attack. And there is no fault [327] upon you if you are in trouble due to rain or you become ill for putting down your arms. But you carry your means of protection with you [328]. Indeed, Allah has prepared for the infidels a humiliating torment [329].