The missing Caravan

Winner: in progress...

The Missing Caravan
Since ancient times Lord Richard from Yew has been engaged in trading with other lords of Britain. His merchants would bring valuable goods from various parts of the world. The merchants were famous for mighty and invincible steeds in their caravan.
One time a horrible incident occurred during the journey. A well-known group of horse thieves of Kalaberden inserted their spy among the caravan guards. Shortly after they acquired the information about the merchants’ map root. During an uneven battle, half of the best horses were stolen. The other half spread in the nearest woods.
Find the missing horses, but beware: the woods are full of mutants and robbers.