http://www.imdb.com/title/tt0077533/ Faces of Death (1978)
A collection of death scenes, ranging from TV-material to home-made super-8 movies The common factor is death by some means.
This was an old low-budget "snuff" film featuring things like people and animals being consumed by predators, as well as executions, etc. Many of these were captured accidentally on nature programs, but some were filmed intentionally (executions).
What Ross saw was NEWER low-budget snuff-type video posted on a chat/message forum. I do not know if there are a lot of websites around that provide this sort of content, but know of two that were active in the early 2000s. Both had extreme pornographic content as well, and were NOT saved in my "Favorites" by any means, but I know "bangedup.com" sometimes had funny "Jackass" type stunts I saw a few of. And when there were three American engineers captured by the Taliban and beheaded, I thought the video I had clicked on would NOT include the brutal execution. On the news, the video was always stopped before that point, and I was shocked when "ogrish.com" had the full video available. It was definitely one of those "wish I could un-see that" moments. I do not know if either of these sites is still running, or if any of this sort of footage is reflective of what Ross was looking at, but assume when they said "war" that it was more like executions, war victims, etc. and not so much of people hitting monkeys with mallets.