Do people still remember battle of Rome 100 B.C? No. The same horror image was there, people dying, blood, people torn into pieces, taken prisoners and tortured. All these things happened years before WWI and WWII, do we still remember it?
No, because if we did WWI and WWII can never happen. There are hundreds of war that happened before WWI and WWII, they're forgotten aren't they? Even though there were the same horrors? To us, this battle in Rome is now just a battle, it doesn't mean a thing.
Sure there weren't films back then, but memories of the war can't be glory, no not for the soldiers. History repeats itself, even if people understood it.
There must be a time when we forget the pains of war, the sufferings and start a war again. There will be a time when our future generations sees the image, and it doesn't mean much for them. They won't morn the horrors these images represents. To them, it's just history.