Boy am i moron! I forgot something. Look here.
Before 1399 Vitautas did two raids into GH territory looting and taking captivities. By the 1399 he would have gone as far as Don river.
So my idea is making all those territories occupied by Lithuania (not owned) from the very start. It won't change the outcome of the war, but will make it a bit harder for GH to win.What do you think of that?
Sorry for double posting. I pushed the wrong buttons.