I had a battle like that, but I don't think it went over 100 days. He completely destroyed my first push which caught me really off guard, and he had more buildings and such, so I couldn't just sit back and let him gain forces. so I made a bunch of rockets to hold him off as best I could, and I had a stream of Mechs going up one side to keep him occupied, and I made a force of about 15 Neotanks. It all worked out but it was one of few times where the computer actually stopped me. I almost never have to retreat, so I still remember that battle cuz it was really intense for a bit.