You pilgrims don't know beans about concussion until you see the grass flatten 30 yards in front of the revetment every time 'Long Tom', 155mm M-2 goes off. Makes it easy to catch grasshoppers.
And another thing, put a pinch of double base powder between cheek and gum and rub your hardhat band with bacon grease for all day satisfaction. I gots other medical advice too, jus' axe me.