The best description of Jakobstadt battle is done by Hugo Uddgren in his Karolinen Adam Ludvig Lewenhaupt Hans Krigsforing I Kurland och Litauen 1703-1708. B. 1 (1703-1704). Uddevalla, 1919. Some years ago it was translated by Dan Schorr for his northernwars.com. Now his site is closed. But Dan Schorr kindly permitted me to put the material in my blog.
If the link doesn’t exist, then let me know in comments to this post. I will re-upload the file.