I do not see how Olvaia would even have the necessity to pull off this kind of attack against nations that are 10 times larger than them. Their standing military, at most, would be 140,000.
Another reason why mechs would be extremely unlikely in Olvaian miliary.
1) They have no alliances that would supply them with the supplies.
2) Having this small of a population makes it hard to believe that you would have a highly-qualified development team develop designs this quickly.
3) Having this small of a population makes it hard to believe that you would have a highly-qualified workforce to build them quickly.
4) Having this small of a population makes it hard to believe that in a relatively-sizable piece of land, you would have suffiecient large urban centers that would be able to supply a workforce.
5) Having this small of a population makes it hard to believe that you would be able to gather so many materials to build them on the tiny piece of land that you are settled on. And don't even assume that it's mineral-rich.
6) Having a tiny army would not allow you to attack multiple targets larger than you and NOT be instantly obliterated.
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Ohey.