Today I was digging through my D&D campaign archives and marveling at the detail I put into many of my maps and "historical accounts". A lot of these works I always did for my own amusement, to keep track of the long running timelines that my group would do. Young me had way more time and energy to record every event that happened in the Flanaess. From players' quest movements, to entire wartime troop movements, I wish I still had the ambition to put a tenth of this effort into my stalled Battles of Greyhawk series.
Map #2 continues on the next three months and we see that the Vesve is completely overrun, places are pillaged and burned including Highfolk town! Some group called the Brothers of Panshazek are on the move (not sure if they're canon or homebrew). Willip is sacked, Chendl and Gorsend see major battles. Things are looking bad for the good guys but there is two significant notations which I assume happened at the end of the year, Iggwilv's Trap and Iuz vs. Philidor (yes I went there). I'm not sure what the trap was and if it was for the players or Iuz. I also don't even recall Philidor facing Iuz in Dorakaa but it all surely culminated (spoilers Greyhawk neophytes) with the Soul Husks being destroyed up north in the Howling Hills.
So there you have it. You can chronicle your player's exploits by use of timeline maps. While the subject is dry I hope some aspiring DM/mapmaker out there can find some inspiration from these scraps of notebook paper.