Boarding net

In this painting by Patrick O'Brien, the United States Revenue-Marine ship Surveyor has raised its boarding net as a force of British Royal Marines close in on the vessel.

A boarding net is a type of rope net used by ships during the Age of Sail to prevent boarding by hostile forces. Designed to hang from a ship's masts and encircle its deck, the boarding net could be deployed during battle or at night when a ship was at anchor in unknown or hostile waters. In the Royal Navy, boarding nets first gained widespread use in the 1790s.

A British boarding axe held by the National Museum of American History
The crew of the Mary Rose were trapped aboard the ship by her boarding net as the vessel was sinking.