How to use "posts" in a sentence

Many of them had been Presidential appointees, occupying high-level posts in the federal government; a few had served on the President's cabinet, in half a dozen administrations, though none had ever deigned to run for an elective position

Stone posts and softly glowing electric lamps marked the way to the front door, and warm light radiated from several first-floor windows.

A large sign stood to the right of the roadway, supported on two redwood posts: