In my view, the marksman promotion is one of the things which needs some work.
As of today i find using assasins combined with some damage dealing mages to be the most efficient when it comes to attacking cities. And from the AI its the assasins I fear the most. No doubt.
I like the assasins a lot cuz it gives you some fear of loosing your mages. I also like the way I can use them to destory catapults and that like. However I find it to easy to simply spam tons and tons of assasins to just crawl all over the place. And its horrible borring to try to defend agains spams of assasin from the AI. The best counter is ironicly to use your own assasin. I must admit that I havent tried the guardsman promotion, but I'm sure a guardsman would die emidetly unless given to one of my extreme-heros which cannot die at the game I'm playing at the moment
The new promotion in version 0.4 makes it easier to see invisible creatures, which is a nice warm welcom. Maybe I'll actually start upgrading my units with sentry I and II just to get the third 'see invisible' promotion
I propose severall idees to fix the marksman, which I also have proposed earlier.
When attacking with a marksman promotion there could be 3 options:
1: The assasination went as planned (same as today)
2: The assasination had to be aborted, but the assasin manged to escape the guards: in game terms this means the attack simply isnt made.
3: The assasination had to be aborted and the assasin got cought.
The assasin gains the 'revield' promotion. No attack is made and the assasin is forced to defend first at next attack against the stack. The 'revield' promotion could also give other negative effects as apropriate.
Which one actually happens can be random. As a start one could try a probability:
1: 80%
2: 10%
3: 10%
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The assasin will most probable get the job done, but atleast once in a while (one in 10) the assasin is revield and can be hunted down by whatever you have available.
Aslo a divination spell which gives the revield promotion to assasins & shadows could be added as a counter to marksman promotion.