Samuel was the only son of the late S H Moorhouse JP and Mrs Moorhouse, formerly of The Woodlands, Offerton. He was educated at Caius College, Oxford and chose the army as his future career serving with the 21st Lancers in South Africa. After leaving the army, he developed an interest in politics and, in 1912, he was the Liberal candidate in a Parliamentary by-election in Hythe, Kent. He lost to the Unionist candidate, Sir Philip Sassoon, by 1718 votes.
When war was declared, in August 1914, Samuel was in the officers' reserve and was recalled to the army, being posted to the 2nd Battalion, Argyll & Sutherland Highlanders, with the rank of Captain. He took part in the early fighting at Mons, the Aisne and the Marne. On 21 October 1914, the Argylls and other British troops were near the French village of Le Maisnil when they were attacked by large numbers of Germans. The book "The First Seven Divisions" by Ernest Hamilton, (published 1916) records "The brunt of the fighting fell on two companies of the Argyll & Sutherland Highlanders who held on under a devastating fire, from 7am until 5pm, till almost every officer and man was either killed or wounded. Sgt Ross' (since killed) gallantry was conspicuous throughout the day and he was recommended by his platoon commander, Captain Moorhouse, for the DCM" .
In the following May, Samuel, by then promoted to Major, was invalided home and, after recovery, undertook home service in Edinburgh. He returned to the front in 1916, having been again promoted, and took command of the 14th Battalion of the Argylls. Shortly afterwards, he was transferred and sent to command a re-enforcement camp until the Armistice in November 1918.
After the end of the fighting, Samuel took a period of leave and returned to his home on the Isle of Wight where he lived with his wife and two children. In 1918, the world was gripped by a devastating epidemic of influenza which claimed millions of lives. Samuel is reported to have died of pneumonia, no doubt as a result of complications from catching the ‘flu.