Invisible wolf

Why I can't to see wolf on adventure?
In adventure Stealing from the rich wolf is don't see
http://prntscr.com/e5l5pj
When I send attack on any camp ,then get in the way find wolf which I don't see .
I please support this to solve

Thanks :)

That's a trap with 120 wolfs. You aren't suppose to see it easily. If you move your mouse cursor across the forest you can find it.

You can see all the wolf traps by looking at a guide, too. Such as this one