In every era you can fight the continent map an era or two ahead. Just follow the main quest and you will get to the point, where you recieve a unit from an age or two ahead of your time. Then use that unit in combination with 7 roughe units to clear the whole 64 levels of GE. In progressive era I got a tank from modern era and a commando from
If he wants to auto-battle, 250/150 will do nothing in industrial (especially annoying age) or higher. I made the mistake to go to industrial to early and it took me a lot of effort to complete each GE. Colonial is a great age to build up your LBs. Small good production footprint, good unit balancing.
FE is the best age. CE is second best and you’ll sit there right at home with your stats. In a 2nd city i have 300/250 in CE and for reference GE4/50 attrition are not a huge problem to get to. CE is awesome, all you need are anti-aircraft vehicles (I think that's what they're called).
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