I don’t know if it was quite the first, but it was maybe the first multiple-night blockade. This was the first day of it I think.

<a href="https://commons.wikimedia.org/wiki/File:First_blockade_at_O%27Connor_Ridge.jpg" rel="noreferrer nofollow">commons.wikimedia.org/wiki/File:First_blockade_at_O%27Con…</a>