thermal imaging...

[PAnz3r]

Your hints helped a lot!

Btw another annoying thing it's the resilience of immobilized tanks...usually they become immobilized inside smoke or forested areas, they seem easy target but for some reason they are able to wipe out every and each unit that approach the adjacent hexes.
The only time where I haven't lost something trying to destroy an immobilized tank, it's when I wasted the actions of 5 tanks in area fire before launch a couple of Mech section to take it out.