how do I go into a warzone and defend myself with a bolt action rifle
Ask the Mujahadeen. Ask the Germans, Italians, and Japanese who faced off against the U.S. during WWII.
They held thier own pretty well against a force with semi-auto rifles.
Hell, ask the old Taliban guy we caught with an Egyptian marked Enfield .303 who only gave it up because he wanted to get medical aid for whom I assume to be his son, who was carrying an AK variant of some sort.