blockade
noun
the isolating, closing off, or surrounding of a place, as a port, harbor, or city, by hostile ships or troops to prevent entrance or exit.
Used to describe an ongoing action or state that is currently taking place in the immediate present.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
I am blockading Genoa, according to the orders of the Admiralty, and in the way I think most proper.
From The Life of Nelson, Volume 2 The Embodiment of the Sea Power of Great Britain by A. T. (Alfred Thayer) Mahan