Curses:
A foreign nation shall besiege your cities (cut off food supply).
Primary Verses:
Deut. 28:52
"And he shall besiege thee in all thy gates,
until thy high and fenced walls come down, wherein thou
trustedst, throughout all thy land: and he shall besiege
thee in all thy gates throughout all thy land, which
YHVH thy God hath given thee."