Question

How did rear admiral john dahlgren of the union blockade of charleston attempt to prevent attacks underwater such as the hunley

Answer 1

"Admiral John Dahlgren, the head of the Union blockading fleet, learned of the diving submarine from Confederate deserters. In response, Dahlgren ordered his blockading squadron to anchor in shallow water...**hang ropes and chains over their sides as defensive measures, and deploy picket craft to keep torpedo-bearing boats away"


I think this means they prevented the armed boats(torpedoes) from firing at the submarines