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In fact, Gao Yuan felt he hardly did anything significant; he simply emptied a dozen or so cannon rounds without knowing where they'd hit, before tossing grenades into the ammunition box and blowing all six 120mm mortar positions sky-high.
He also threw grenades haphazardly in areas hidden from the enemy's view, remaining concealed in the trenches, killing at least a dozen. Numbers weren't the key thing, though; it was crucial that the officers Gao Yuan took out were essentially low-level, with the highest-ranking being a lieutenant.
The command post remained untouched, simply because it couldn't be found. But don't forget, Gao Yuan had specialized training in operating heavy machine guns. So when he spotted a heavy machine gun position, he couldn't resist the urge to swing the gun around and unload several belts of ammo.