Q-ship Along with and , Eagle was selected early to participate in a secret "Q-ship" program. The intention was to disguise the ship as a defenseless civilian vessel and, after luring an enemy submarine into close quarters on the surface, open fire with hidden guns and sink the unsuspecting U-boat. For this reason, Eagle remained at Portsmouth, where she underwent further conversion into a Q-ship and received weapons and sonar gear. During this second conversion, the minesweeper was renamed Captor and redesignated PYc-40 on 18 April. With alterations complete on 19 May, the vessel reported for duty with the 1st Naval District at Boston.
Q-ship Along with and , Eagle was selected early to participate in a secret "Q-ship" program The intention was to disguise the ship as a defenseless civilian vessel and, after luring an enemy submarine into close quarters on the surface, open fire with hidden guns and sink the unsuspecting U-boat. For this reason, Eagle remained at Portsmouth, where she underwent further conversion into a Q-ship and received weapons and sonar gear. During this second conversion, the minesweeper was renamed Captor and redesignated PYc-40 on 18 April. With alterations complete on 19 May, the vessel reported for duty with the 1st Naval District at Boston.