The endless historical battlefield that began with World War I

A military blogger is pulled into real historical battlefields by a system. In the muddy trenches of World War I, he must survive amidst poison gas and machine gun fire; in the arenas of ancient Rome, he must fight his way through the cheers of thousands; in Jerusalem during the Crusades, the blades of the Templars and Assassins clash under the moonlight; in the Caribbean during the Age of Exploration, endless gold and betrayal lie beneath the black flags of pirates; in the wilderness of the American West, civilization clashes head-on with barbarity amidst the smoke of revolvers… What others see as hopeless situations are historical answers for him. In the trenches of World War I, he led his entire company out of the meat grinder alive; in ancient Rome, Spartacus invited him to conspire in a grand uprising; in Jerusalem, Richard the Lionheart sought his advice on siege strategies; in the Caribbean, the invincible Armada was reduced to ashes by his fire ships; in the American West, the "gunman faster than death" became a legend… The afternoon tea and aristocratic hypocrisy of Victorian estates, the intrigues of the Roman Senate and the roars of gladiators, the holy light and daggers in the darkness of Jerusalem, the spirits, treasures, and skull and crossbones flags flying high in the Caribbean. He was a ghost in the trenches, a butcher in the arena, an assassin in the holy city, and a plunderer at sea. (Historical infinite flow + intense survival battles + immersive historical recreation)