From
苏轼《江城子·密州出猎》 (Su Shi, Northern Song, 1075), written during a hunt at Mizhou and a turning-point for
豪放 (bold/martial) ci. The closing line
会挽雕弓如满月,西北望,射天狼 means: I shall draw my carved bow as round as the full moon, gaze northwest, and shoot the Sirius wolf.
天狼 = Sirius, a star symbolizing the Western Xia invaders.