Digital Doom on the Highway to Destruction

The battle known as Digital Doom on the Highway to Destruction took place prior to the construction of Autobot City on Earth.

An Autobot convoy consisting of Optimus Prime, Hot Rod (or possibly Rodimus Prime), Cliffjumper, Cosmos, Mirage, Ratchet, Sunstreaker, Warpath, and Wheeljack set out to determine a building site for the city. They were ambushed en route by Megatron, Thundercracker, and Reflector. The outcome is unknown, but Rodimus Prime, at least, considered it the greatest battle the Transformers ever engaged in on Earth.