Frederick Wordsworth Ward (c. 1835 – 25 May 1870), better known by the self-styled pseudonym of Captain Thunderbolt, was an Australian bushranger renowned for escaping from Cockatoo Island, and also for his reputation as the "gentleman bushranger", his marriage to an Aboriginal woman, and his lengthy survival, being the longest-roaming bushranger in Australian history.

It has been said Thunderbolt "probably ranks equal with Ben Hall as Australia's second-favourite" bushranger, after Ned Kelly.

Frederick Ward was the son of convict Michael Ward, ("Indefatigable" 1815) and his wife Sophia, and was born in about 1835, the youngest of ten around the time his parents moved from Wilberforce to nearby Windsor. Ward entered the paid workforce at an early age, and was employed at the age of eleven by the owners of "Aberbaldie Station" near Walcha as a "generally useful hand" although he remained with them for only a short time. He worked at many stations in northern NSW over the next 10 years, including the famed horse-stud Tocal, and his horsemanship skills soon became evident. Buckbreaking became one of his most important duties. Not much is known about Michael and Sophia's early married life, but they had ten children; William "Harry", Sophia Jane, Sarah Ann, Amelia "Emily", Edward B, Joshua, George E, Esther P, Selina Maria and Frederick Wordsworth (a.k.a. Thunderbolt).

In 1856 Ward's nephew John Garbutt became the ringleader of a large horse and cattle stealing operation, and enticed other members of the extended Ward family to join him. Fred Ward helped drive some four dozen of the stolen horses from the Lambs Valley property of his brother William to Windsor where they were sold at auction. Ward and his nephews John and James Garbutt were all convicted, the Garbutts of horse-stealing and Ward of receiving stolen horses knowing them to be stolen. They each received a sentence of ten years with hard labour and were sent to the Cockatoo Island penal establishment.

Released on tickets of leave after serving four years, Ward and his nephews settled in the Mudgee district where John Garbutt met and married a wealthy widow, Elizabeth Blackman, owner of Cooyal inn and station. They employed Fred to work for them at Cooyal. There Fred met Mary Ann Bugg, who was then living with ex-convict James McNally and her children at their Cooyal farm. Mary Ann fell pregnant with Fred's child a short time later. In breach of ticket-of-leave regulations, Ward left the Mudgee district to take Mary Ann back to her father's farm at Monkerai near Dungog for the baby's delivery. He returned late for his three-monthly muster and, consequently, the authorities revoked his ticket-of-leave. Ward compounded the problem by arriving in Mudgee on a "stolen" horse (although the owner admitted at Ward's trial that the horse had simply gone missing from his property, that he had "heard" that it had been seen near Cooyal but that he had not attempted to retrieve it). Ward was sent back to Cockatoo Island to serve the remaining six years of his original sentence plus an additional three years for being in possession of a stolen horse.

On 11 September 1863 Ward and a companion, Frederick Britten, slipped away from their Cockatoo Island workgang and hid for two days before swimming from the north side of the island, almost certainly to Woolwich. While most Thunderbolt books claim that Mary Ann Bugg assisted Ward in his escape, others claim she in fact remained working in Dungog throughout Ward's second term on Cockatoo Island, and did not see him again until after his escape.

Ward and Britten headed to the New England district where they robbed a shepherd's hut at Gostwyck, near Uralla on 24 October. Three days later, while they were waiting to ambush the mail near the Big Rock or Split Rock (now Captain Thunderbolt's Rock), they were spotted by troopers. In the ensuing gunfight, Ward was shot in the back of the left knee, an injury that left a critical identifying mark that helped to identify his body after his death. The pair separated a few weeks later. Ward gained the nickname "Thunderbolt" during the Rutherford toll-bar robbery on 21 December when the toll-bar keeper told Police that the door burst open like the sound of a thunderbolt. The newspaper (Maitland Mercury) reported this and the name stuck. Nobody knew the identity of the hold-up man at that time.

Over the following six-and-a-half years, Ward robbed mailmen, travellers, inns, stores and stations across much of northern New South Wales - from the Hunter Valley north to Queensland and from Tamworth nearly as far west as Bourke. He was accompanied by three other men, early in 1865, when he went on a crime spree in the north-western plains, but the gang disbanded after young John Thompson was shot and captured at Millie, near Moree. Later that same year, he joined forces with another two felons but his second gang disbanded soon after one of them, Jemmy the Whisperer, shot a policeman. There is no evidence Fred Ward actually ever shot at anyone during his bushranging career. He was known to show his guns rather than brandish them or discharge them. Instead he relied on superior horseflesh to make good his getaway. He is credited with having stolen or commandeered over 40 thoroughbred racehorses in his time on the road. Thereafter Ward employed only young malleable accomplices: Thomas Mason in 1867 and William Monckton in 1868. After Monckton left him, Ward remained largely in seclusion, surfacing only a handful of times in the next eighteen months to commit robberies.