Prayer: If fighters can’t recite Fātiḥah or perform rukūʿ and sujūd during battle, how should they pray?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: If fighters can’t recite Fātiḥah or perform rukūʿ and sujūd during battle, how should they pray?

English:

Question #721:

If combatants on the warfront cannot recite the Fātiḥah or perform prostration or rukū‘ due to the intensity of battle, how should they say prayer?

Answer #721:

They should perform prayer in any possible way and if they cannot perform rukū‘ and prostration, it will suffice to do them through gestures.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer