So it seemed there was only one road to mercy, and that was by declaring me insane. At the time I had little objection. The magistrates decided that I was the victim of periodic bouts of insanity, during one of which I had assaulted the officer on his black horse. It was a form of lunacy, they agreed, that should yield to treatment. This made it possible for me to be released into the care of my aunt.

She arranged for me to board with Dr Haines, whom she had consulted during my trial. Haines was a humane man who disliked chaining up his patients like dogs and who lived with his own family not far away from them. "I hold with Terence," the doctor said to me. "Homo sum; humani nil a me alienum puto. To be sure, some of the poor fellows have unusual habits which are not always convenient in society, but they are made of the same clay as you or I."

Most of his patients were madmen and half-wits, some violent, some foolish, all sad; demented, syphilitic, idiotic, prey to strange and fearful delusions, or sweeping from one extreme of their spirits to the other in the folie circulaire. But there were a few like myself, who lived apart from the others and were invited to take our meals with the doctor and his wife in the private part of the house.

"Give him time and quiet, moderate exercise and a good, wholesome diet," Dr Haines told my aunt in my presence, "and your nephew will mend."

At first I doubted him. My dreams were filled with the groans of the dying, with the fear of death, with my own unworthiness. Why should I live? What had I done to deserve it when so many better men were dead? At first, night after night, I woke drenched in sweat, with my pulses racing, and sensed the presence of my cries hanging in the air though their sound had gone. Others in that house cried in the night, so why should not I?

The doctor, however, said it would not do and gave me a dose of laudanum each evening, which calmed my disquiet or at least blunted its edge. Also he made me talk to him, of what I had done and seen. "Unwholesome memories," he once told me, "should be treated like unwholesome food. It is better to purge them than to leave them within." I was reluctant to believe him. I clung to my misery because it was all I had. I told him I could not remember; I feigned rage; I wept.