I watch a lot of history-based TV shows (when you can find them - the History Channel is now the "Finding the Bigfoot/Ancient Aliens Connection" Channel.
Anyway, I couldn't help wondering what it felt like to be on the castle walls the first time a catapult or trebuchet was used. Sort of reminds me of a Gahan Wilson cartoon with two cowboys noticing the Indians had started lighting their arrows. One says to the other "They can do that?"
I assume the same "what is THAT thing?" moment occurred the first time the Roman phalanx was deployed. Same for when the first infected cows were hurled over the walls, when the first heads of prisoners of war were hurled over the wall, when giant balls of flame were hurled over the walls, etc.
By the time we got to the A-bomb the "what is THAT thing?" realization time shrank down quite a lot. I wonder how many people killed in Nagasaki and Hiroshima even knew it was a US attack that killed them?