Harold had been born locally and lived with his mother at 11 St Paul Street, Brinnington, Stockport.
When he left school, he started an apprenticeship as a hairdresser, but later went to work for Harrison, Scott & Co. He enlisted between December 1914 and April 1915 and quickly left to go on active service at Gallipoli.
The Battalion's War Diary for September 1915 records that whilst 2 soldiers had been killed in the month, 352 men were away from duty due to sickness. This was nearly 50% of Battalion strength and it represented the extremely unhealthy conditions prevailing, due to lack of water, food and problems connected with the heat of a Turkish summer.
Many contracted dysentery - a potentially fatal condition - and Harold was no exception. He was evacuated, on a hospital ship towards Malta and, the day before he died, a chaplain aboard the ship wrote to his mother. Harold had asked him to write as he was feeling very weak and unwell. They were expected to land at Malta that day and he hoped to recover in hospital.
A few days later, however, Mrs Horrocks received official notification from the War Office that he had, in fact, died in the hospital.