NO you can NOT make war or kill.
"Blessed are those who make peace.
They will be called God’s children." Matthew 5:9


"If you say, “The Lord is my refuge,”
and you make the Most High your dwelling,
10 no harm will overtake you,
no disaster will come near your tent.
11 For he will command his angels concerning you
to guard you in all your ways;
12 they will lift you up in their hands,
so that you will not strike your foot against a stone."
Psalm 91