I would say the alphabet. It may have been created thousands of years ago, but it is the base of our culture. Without the alphabet, you would not be able to communicate with anyone. This means their woulf be no human interaction in the world. Without tge alphabet, we would have any of the technologies we have today.
It has to be the last line since he is showing leadership by taking them and making sure his men didn't fall for the trick he took what was most important the will and health of his men i hope it helped
