Jarl of Skellige's troop

The Forces of Skellige is an army hallowed, sea-wolfic traditions. This army has fought against almost every coastal kingdoms such as Nilfgaardian Empire (most prominently), Cidaris, Novigrad, Verden and Kerack as mentioned in The Witcher 3 by some of Clan an Craite warriors, by the Nordlings and Nilfgaardian theyre callad pirates.

Soldiers
Skelligan warriors are known for that they fear almost nothing, they are attacking and looting Northern Kingdoms and Empire for a long time and they have a practise in it. Peoples and also some kings on Continent fears them, and they rather have to. Skelligers also appear at side of Nordlings during Wars in quest to avenge their king (Konung Eist) and queen (Madron Calanthe), they fought Marndall, Brenna and even help Verdeni guerrilas (with help of Cidarian fleet) banish Nilfgaardian army group West from Verden where pro-northern king Kistrin start his reign shortly after.

Fleet
Fleet is an essential part of Islands military, leaded by Jarl of Skellige (supreme leader of fleet) they spread havoc from Kerack to coasts of Ebbing and Maecht in Empire of Nilfgaard, there is not that big number of ships like Redania or Kovir have in fleet, but they are swift and from exclusive wood.

Some of drakkars

 * "Anigra" - Clan an Craite
 * "Daria" - Clan an Craite
 * "Drac" - Clan an Craite
 * "Ringhorn" - Clan an Craite
 * "Scorpion" - unknown
 * "Tamara" - Clan an Craite
 * "Triglia" - Clan an Craite
 * "Fenris" - Clan an Craite
 * "Havfruya" - Clan an Craite

Trivia

 * In The Swallow's Tower, the residents and the beliefs of Skellige largely resemble the real-world "Vikings" and Norse mythology.