Militia; the poor man's Commando.
[WARNING: Contains Hyperbole)
Thanks for pointing out that Commandos are also 'stealth' in Plains terrain, but Militia still beat them...
I didn't used to even research, Militia, until I realized that they are not your typical, stackable fighting unit. They are more like the Spy unit in the old Tesla Wars game...
Now, I research them, as soon as I cap a city with a barracks.
Advantages:
Cheaper, expendable, faster to produce, available earlier, faster movement then the unwieldy stacks players insist on marching in. (You stack to fight; not to march.)
Elite Militia allow one to win the game, before Commandos are even available to research... A level one Commando is going to be spotted by a destroyer 30 miles off shore, while your Elite lvl3 Militia is having a croissant, in a Parisian Cafe, un-noticed
Like, Troop Transports; always upgrade, Militia or AT guns as soon as it is available. Best bang for your buck in this Economy intensive game...
The fact that they must stick to the Forest and such, makes their movement paths fun, and exciting for your opponent. (Once, Sweden, who had declared war on ME, wrote in his 'quit message', to 'go terrorize someone else'. It was probably the Militia...)
Gambit #69: Get RoW with everyone you can; never Shared. Fill every one of their Dots with Militia.... It's just insurance: Some Allies turn to the dark side Terrorize them in your sleep.)
(And, no; Cars are not fighting units, but you do need one per stack... When you split the stack to march. force march the Car to the next dot, and your entire stack avoids the 'moving on enemy territory' degradation. Your entire frontline moves twice as fast: You win the game in 2 weeks, instead of 4.)
"Only AI wannabes stack an AA gun with an infantry unit and expect to get anywhere this year" - Ronald McDonald