The following is the entry for Peter Cracroft in William O'Byrnes 1849 'Naval Biographical Dictionary'.
CRACROFT. (Commander, 1846.)Peter Cracroft, born 15 March, 1816, is second son of Robt. Cracroft, Esq., of Hackthorn, co. Lincoln, Lieutenant-Colonel of the North Lincolnshire Militia, and a Deputy-Lieutenant; and nephew of the present Sir Wm. Amcotts Ingilby, Bart., as also of the late Capt. Sir Robt. Barrie, R.N.
This officer entered the Navy 4 June, 1830; passed his examination 20 March, 1835; and at the date of his first promotion, which took place 26 Aug. 1841, was serving as Mate on board the Southampton 50 flag-ship at the Cape of Good Hope of Sir Edw. Durnford King. He became, 6 Aug. 1842, Flag-Lieutenant, in the Victory 100, to Rear-Admiral Hyde Parker, Admiral-Superintendent at Portsmouth; and, on 12 Oct. 1846, was advanced to the rank of Commander. Agents – Messrs. Stilwell.