The Night's Watch is a society of warriors and rangers who protect the Seven Kingdoms from what lies north of The Wall. They dress all in black. Many criminals are given the choice of joining the Night's Watch to avoid their sentence. Desertion is punishable by death.
Trajectory
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At the beginning of A Game of Thrones, the Night's Watch is undermanned, with less than a thousand men, losing men to desertion as well as on rangings north of the Wall.
