The Last Moving Fortress

This work is not hard science fiction. The general background is a future world where government forces and opposition forces are at war. The protagonist of the war is a land ship called a mobile fortress. There are many characters in the work, and they will describe this world-changing war from multiple angles. The war may be a mutual peck between the commanders of the two sides, or it may be a one-sided massacre, or it may be more likely to be the struggle and friendship of some small people.