Smoke Over the Forest

It's a distant future, centuries after apocalypse and the loss of the civisation we know. The Earth went through drastic changes so did the human race.

Three friends graduate from a military school and look at their surely bright future but the conflict across the sea means a war is coming for them.

Strangely, all the clues lead towards a gigantic forest covering half of the nearest continent. The area has been sealed for millenia, the entry is forbidden. The only thing known about it are rumours.

I humbly ask for linguistic and grammatilac help, as my first language is not English.