The absence of chat means everyone found it easy? I finished it without necessarily understanding how. Help parsing 36d please. Plan to invade hills in US winds up? On the contrary (10) DOWNDRAFTS. But why?
DRAFT - plan
in DOWNS - hills
and DOWNDRFATS are the reverse of "winds up". I don't see why it needs US, though - it's an expression over here as well, as are the hills.