okay, I used the chapter unit editor and switched out the data for the generic enemy bandit with the data of the tactitian. the coordinates he was set to appear in were 2,6 and he was a swordsmaster. However, when I started up the game, all that happened was the tactitian being a swordsmaster as an other unit, not appearing on the map as blue. Also I had edited the map so that another unit would appear in the top left area.
Sorry for being vague to start with.