Skeleton army in foreign land, dream and sketch

A skeleton army is approaching human settlement. 

base camp
From tent we go into ancient fortress, but a ghost tells me it’s the skeleton army’s home base.  
ancient temple
ancient temple
A small boy and his dog wander freely in the army, unnoticed. Why?

boy and dog walk free in army
I escape with a few others to a fortress tower, abandoned by old civilization, in the middle of the lake. 

tower in lake
tower in lake

Here the army can approach one by one but we knock them down into the lake and they give up. 
Trapped in the tower a ghost man appears and shows a mirror apparatus he used to spy on the surrounding area. Another ghost appears and opens a trap door in the floor to her room. I’m concerned it’s a tomb she might shut us in. 

dream map
full picture