The peace concluded in 1763 reduced the size of the army, and forced Roche to retire in indigent circumstances to London, where he soon lived beyond his income. In order to repair it, he managed to marry a Miss Pitt, who had a fortune of £4,000 (approximately £100,000 in today's money). On the anticipation of this fortune, Roche engaged in a series of extravagances that accumulated debts beyond his marriage portion. He was arrested and cast into the King's Bench Prison, where his wife divorced him and where so many detainers were laid upon him so that it seemed unlikely that he would ever go free. However, a legacy left him by a relation enabled him to escape confinement.