I wrote this scenario over the past month and got to play it out last week with a couple of friends. Because there was a lot of hidden movement as a result of the rain and fog, I refereed. It was fun to take a rule set, in this case Over the Hills, and tweak so it could do what you need it to do for an unconventional battle such as this.
The full report and link to the scenario is on my blog, but here are a few of my favourite shots from the action, with a bit of cheesy Photoshop fog effects added in for atmosphere. Someone suggested one man with a cigar could have achieved the same effect!
https://tinywarsplayedindoors.blogspot.com/2022/08/the-combat-at-sabugal-april-3rd-1811.html?sc=1659645900496#c6770664542055749544