Police charged a man with reckless wounding after a confrontation in Shanes Park on Monday.
At about 4.30pm officers were called to a home in Palmyra Avenue after reports of an argument between two men in the front yard.
Police found a 29-year-old man with a deep cut to his face, allegedly caused by him being struck with a metal pole.
He was taken to Nepean Hospital and is expected to need surgery.
Police arrested a 47-year-old man at the scene and later charged him with reckless wounding and also served him with a personal violence order.
He was conditionally bailed and appears in Mount Druitt Local Court on June 30.