I have never in my life heard it this way and I greatly disagree. Tactics definitely involves groups of units.
Furthermore grand strategy games are not strategy, they are grand strategy, hence the name. Strategy is eminently possible with a few thousand units or even many hundred. And strategy is not economics. Economic strategy could be economics, but military strategy is military.
I'm in agreement on that, I thought the classification was a little off. I had commented it originally but removed that part because I thought I came across to aggressively. and figured I would ignore it. However, what I would like to see is a list that expresses this clearly. Someone taking ownership of these terms that is a trusted source. And so far both of you have made reference to terms without expressing a source for it. So far, your statement sounds more credible, but references would be great. Thanks!
Also what kind of idiot refers to a whole nations army as 10 million soldiers? What the hell kind of nation are you talking about?
However, I thought this section was a bit rough. I mean you no offense, but I'd like things to remain constructive, and I felt this response was a little too negative.
Most nations don't even have 10 million people total. The United Stats Army, the second largest in the world, after China, has a little over 2 million soldiers, with almost a million only on reserve duty.
Most nations have a few hundred thousand total or less and obviously only some of them in any given war and only some in any given battle in a war.
But for useful information, I'm glad you brought this part up. Those are numbers I hadn't even thought about. I wasn't too concerned with it though. I'm planning on using a somewhat low number. Such as squads of 10 to 40, but potentially a hundred or so of those across a planet, which will be broken up into different map managers, and probably split on to different servers.