Do you guys know the name of a movie where a bloke gets trapped

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Do you guys know the name of a movie where a bloke gets trapped in the past (Medieval times), he has his car, and does fight in a war. He taught Greek fire to some;
An alchemist/wizard gives him a potion that allows him to sleep for 100 years per drop, but he miscounted. The end scene is him waking up 100 years too late. I watched it on TV around 2002-2004, but it could be older than that. It's driving me mad that I can't think of it!