"For thousands of cycles, the war with the Quintessons had been a brutal conflict. Until Sentinel, the principal aide to the Primes, intercepted an enemy transmission. There was going to be a secret gathering of Quintesson commanders. Their elimination could end the war. It was a mission so important, we Primes took it on ourselves. We agreed to meet Sentinel for his sensitive intel in secret, here, in this cave. But we were not alone. [...] We were outnumbered but stood as one. Our victory was near. Until we were betrayed. [...] But Sentinel never understood the true power of what he desired. The Matrix of Leadership can only be wielded by one that Primus himself deems worthy. And Sentinel most certainly was not."
January 1, 1970
https://en.wikiquote.org/wiki/Transformers_One