You're looking for a verified PDF of "A Soldier from Tomorrow" by Harlan Ellison. Here's some solid text and information to help you:

The story is most famous today for its legal connection to the 1984 film The Terminator

Adaptations: Ellison adapted the story into the famous 1964 episode "Soldier" for the TV series The Outer Limits. The "Verified" PDF Status

The Incident: During a massive future battle, an energy weapon strike creates a "time vortex," hurling Qarlo back to the present day.

Ethically? Complicated. Ellison despised unauthorized sharing. As he once said, “I don’t have a problem with you reading my work. I have a problem with you stealing it.” If you respect the author, you would not download an illegal PDF.

If you are a student or academic, you can request a high-resolution PDF scan for research purposes. This is a verified copy, but you cannot distribute it.

The Credit: Later prints and home video releases of The Terminator include a mandatory credit: "Acknowledgment to the Works of Harlan Ellison".