Total War: Warhammer III

Easier done with Goldtooth. From time to time you will see Cathay caravans going through your lands or those of others. They are recognisable by their distinct banner and fast movement. Your armies will likely not be able to catch up to them and as such it is easier to interecept when you see them. Simply save before declaring war, destroy them and reload, should it put you in a bad position. Often times they are easy to beat, especially early on.