I agree that modern weapons are probably much more fear inducing than previous weapons like bows and spears. I would feel terrified if there were a group of people with melee instruments on the other side of a stone wall clamoring over to get me. But I know I can take cover from direct fire weapons and will be perfectly safe. I have felt the extreme fear of accurate incoming artillery. After the first experience all the fear responses to all incoming fire were similar. It’s like the feeling of thinking you’re about to win the lottery in reverse. Wondering where the next one falls did the gunner adjust 30 to the left or right or is the effect coming since the last round blew dust and rocks all over you. Terrifying.