As time passed, the battlefield became increasingly chaotic. Both the Orc Army and the Human Army found themselves in the awkward predicament of "soldiers not knowing their generals, and generals not knowing their soldiers."
The situation was slightly better for the human soldiers, as ordinary soldiers didn't have many enemies for life. Even if they had a few personal enemies, the chances of encountering them on the battlefield were slim.
The Orc Army was different. Despite being united in combat, the racial hatred accumulated over countless years could not be eradicated with a single command.
After falling into great chaos, the original military order also lost its restraining force on everyone.
Someone started a bad trend of ruthlessly killing the different races who had mistakenly joined their own troops, and it quickly spread to the entire army.