Day 341 - 11:46 AM - Sumida River, Ruins of Tokyo
The invading Demons and the brave Onmyojis clashed in a heated battle of life and death. This scene on the frozen river was such a rare sight that one would not even see in anime and movies. In fact, Mark was pretty sure he had not seen any of this kind in any existing media.
And looking at the festival-like scene below, the movie titled The Great Yokai War that Mark mentioned earlier was the closest, although it did not involve Onmyojis. As for actual battles between Demons and Exorcists, it could barely be called a war. Most of the time, there was only one powerful Demon. Even if there was an army of Demons, the Exorcists fighting them were either a single person or just a group of student Exorcists.
As for a full-blown war, Mark had never seen such.