movement white mountain hex side

[Gratch1111]

So Gre has a unit in 70/48 and 71/48. Italy has units in 70/47 and 70/49. Between 70/48 and 71/48 is a white hex side that I understood as unpassable, however I just discovered that Gre can move that unit over that white hex side into 71/48. Am I missing something or is it just supply that can pass but units can, If so it makes no sense that you can move a unit over a white white hex side but not supply

[Courtenay]

The Greek unit that can make that move is a mountain unit. Mountain units can move across white hexsides. No other land units can. A mountain unit can't trace supply across white hexsides, which often makes it unwise to cross, but they can cross.

The Italian mountain unit can do the same across one white hexside on the French border. It won't be able to attack (no supply), but it might put a French unit out of supply.

[Joseignacio]

That's impassable ...

... except for mountain troops and I believe GRE has one in the initial setup when at war. Supply doesnt cross.

Edit: Courtenay was faster and more complete!

[Gratch1111]

Ok, get it

[Orm]

I would like to add that a MTN is allowed to attack across a Alpine Hexside. Albeit it is halved in strength when doing so. If it meets all other requirements to allow the attack, of course.