To ask I need a quote
"Thus saith the Lord concerning the kind of Assyria, He shall not come into this city, nor shoot an arrow there, nor come before it with shields, nor cast a bank against it ... For I will defend this city to save it for mine own sake."
Isaiah 37:33, 35
quoted in "The Sign And The Seal" by Graham Hancock.
What is the meaning of the phrase 'nor cast a bank against it'? I ran some Google searches on "cast a bank" and all led me to the same paragraph. Is some kind of wall-breaking weapon or device meant here?