Originally Posted by Apache
I seem to remember reading a Larry Niven short story about the start of the wars. It was about a human exploration ship encountered by the Kzinti. The Kzinti were going to destroy the unarmed ship and the crew, and Earth in general, were pacifists. One was not as pacifistic and used the ships photon drive to destroy the Kzinti ship. This was sometime in the mid to late '70s.
Yes, that's the first modern meeting of Man and Kzin. One of the stories in this book concerns Earth's reaction to the reports from that encounter.