The image of 'ghosts of the dead' comes from a book that I thought was Green Mars by Kim Stanley Robinson but wasn't.
It was a story about a utopian community that was under attack from a military force that was trying to take forests from the community. The decision was made to resist the military by dressing as the ghosts of people they had already killed - this caused horror and a breakdown amongst the troops. There was also struggle and tension about the best methods to use.
There was also, I think, a disturbing account of a highly monitored prison camp in a barren landscape - this included stuff about disturbing sexual relationships between two key characters. One of these characters was also something of a seer or dreamer I think.
Does this spark a memory for anyone? The idea led to a 'ghosts of the dead' action against the Iraq war. To have the book would be good.