Southern Raiders frigate

Southern Raiders Frigates were raiding ships used by the Fire Nation Navy unit known as the Southern Raiders. They were used as a means of transportation to raid various locations, primarily the Southern Water Tribe.

History
At least three frigates, housing a large number of Firebenders, were used as a means of transportation by the Southern Raiders during the Southern Water Tribe Raids, a series of devastating assaults committed against the tribe prior to the start of the series.

Years later, Zuko and Katara attacked one of these ships patrolling near Whale Tail Island in an attempt to track down the Raider's captain who killed Katara's mother six years prior.

The fate of these ships after the war is unknown, though it is likely they won't be used during raids anymore after Fire Lord Zuko proclaimed an era of peace.

Layout
Southern Raider frigates appear to be large-sized, naval vessels where advanced metallurgy is utilized. It is presumed that the ship includes compartments below deck to store various weapons and mechanisms for future use in battle as well as cabins to house soldiers. Red flags bearing black Sea Raven icons, the symbol of the Southern Raiders, were flown atop the masts.