Ancient Europe - European War series, #1

The protagonist is Dumont, a newly graduated British college student. Unfortunately, he was hit by a car. After the accident, Dumont's eyes went dark, as if he was in the void. Suddenly, a bright light hit him, and Dumont felt uncomfortable. When he opened his eyes, he saw a Western man with a small round helmet on his head and an extremely ugly face. He put his face in front of him, and a mace was hitting his head...