tip: (idk if this is gonna help but this might ig) if it's a small war the invader/defender (if they win) they will only gain small amounts of land and for big it's like big gains (example ww2) and for borders use rivers or mountains, new sub btw.
How does germany somehow only loose 17k men when its army is in such a horrible shape while their neighbors with good military like france and even poland nowadays are loosing so much men