A 45-year-old woman is in a critical condition after suffering serious head injuries.
Police were called to the incident in Hale Close, Bracklesham Bay, where they found the injured woman.
She was taken to St Richard's Hospital in Chichester but her condition was so serious she was transferred to a special neurological unit in Southampton where she underwent immediate emergency surgery.
Her condition is said to be critical.
A 37-year-old man was arrested shortly after the incident, which took place at around 9pm on Friday, and remains in custody.
Police are appealing for witnesses to come forward and contact them on 0845 60 70 999.
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