I suspect this is ["Victory Unintentional"](https://en.m.wikipedia.org/wiki/Victory_Unintentional) a classic short story by Isaac Asimov.

3 robots are sent to explore Jupiter and meet the potentially hostile inhabitants.  Although they make no threats or overtly hostile acts, they accidentally kill an experimental specimen by irradiating it, and in other ways prove themselves far more robust than the Jovians.  (Entering from space in a ship with no atmospheric control was one factor.)

In the end the Jovians decide they don't want to get in a fight with these "Earthmen" and agree to a treaty.