Cities around the world are littered with remnants of the Salaarniens' attempt to include Earth in a jerry-rigged StellaPort network until a better connection could be made. It was going to make travelling here easier and shorten the time required for reinforcements to get here. Advies were instrumental in sabotaging those efforts. And soon afterwards, most Salaarniens left. So it was always believed that Earth defeated them. But that was never actually the case.