Indra is the central deity of the Rig Veda and is considered the most valiant in war. Hence it is no surprise that the chant for security during war and attack is Indra Gayatri.
Chanting Indra Gayatri gives one a security and protection in war and also ensure success against the opponent. Here is Indra Gayatri:
Aum Sahasra Netraye Vidmahe
Vajra Hastraye Dhimahi
Tanno Indrah Prachodayat
You can either type this chant or mentally chant it. If you are mentally chanting use the copy paste method to keep track of your count. Chant a minimum of 108 times and do the chant for 11 days.
You can search for this chant by typing the keywords ‘security’ or ‘indra’ in the search chants page. (Click on ‘Select Available Chants’ to go to the search page.)
Keep your mind focussed and on the words you are chanting. Meditate on the warrior aspects of Indra while you are chanting or typing.