It is a very simple Basic skirmish rules of operating a melee consisting of commanders, close soldiers and long-range soldiers.
https://desuarchive.org/tg/thread/60094729/#60094729
https://img.fireden.net/tg/image/1527/84/1527842838228.pdf
https://cdn2.desu-usergeneratedcontent.xyz/tg/image/1527/96/1527965695338.pdf