Let $k$ be a local field, and $U$ the group of units.
In a proof I read
"by local class field theory, there is a continuous surjective homomorphism $U \to I$"
where $I$ is the intertia groups at a certain prime of $k$.
Can someone point me to the result in local class field theory from which this follows and/or give a brief derivation if it isn't obvious? I have Neukirch's book on ANT at hand, and I can get Lang's.