# Manasseh built ... He surrounded ... He put

"Manasseh commanded his workers to build ... They surrounded ... and raised ... He commanded his workers to put" 

# Gihon

"the waters of Gihon". The name of a spring and a stream. See 2 Chronicles 32:30. 

# the hill of Ophel

Translate the name of this hill as you did in 2 Chronicles 27:3.

# raised the wall up

"built the wall up"

# the fortified cities

This refers to cities with walls around them.