"...The claims of both parties are on grounds which I fancy we have taught the world to set little store by. The rights of one generation will scarcely be considered hereafter as depending on the paper transactions of another.
My countrymen are groaning under the insults of Gr. Britain. I hope some means will turn up of reconciling our faith and honour with peace: for I confess to you that I have seen enough of one war never to wish to see another."
--Thomas Jefferson, 1794
Somewhere or another, I read that a cavalry charge needs a certain number of horses who have never been in combat before to be effective.
You put those horses in the front, because they don't know what's coming.
No idea if it's true or not, but it does seem to have some utility as a metaphor.