"Trap ship" was an expression used by Admiral Pawal Hahlynd of the Royal Dohlaran Navy to describe vessels modified to deceive Charisian privateers.
The trap ships were converted galleons that were capable of carrying extra weaponary and matchlock equiped infantry. (BSRA)
In the days leading to the Holy War on Charis, the Dohlaran galleon Guardian was converted to carry eighteen falcon cannons. During the Lizard Island Naval Action it nearly defeated the Charisian priveteer schooner Blade. (BSRA)