Background: Yelberton Abraham Tittle Jr. (October 24, 1926 - October 8, 2017), better known as Y. A. Tittle, was a professional American football quarterback. He played in the National Football League (NFL) for the San Francisco 49ers, New York Giants, and Baltimore Colts, after spending two seasons with the Colts in the All-America Football Conference (AAFC). Known for his competitiveness, leadership, and striking profile, Tittle was the centerpiece of several prolific offenses throughout his seventeen-year professional career from 1948 to 1964. Tittle played college football for Louisiana State University, where he was a two-time All-Southeastern Conference (SEC) quarterback for the LSU Tigers football team.
Context: Tittle threw the ball from a sidearm, almost underhand position, something novel at those times, though it was common practice in earlier decades. It was this seemingly underhand style that drew the curiosity and admiration of many fans. In tandem with his baldness--for which he was frequently referred to as the "Bald Eagle"--he made for a very striking personality. Despite his throwing motion, he had a very strong and accurate arm with a quick release. It was because of his quick release and ability to read defenses that he became one of the best screen passers in the NFL. He was a perfectionist and highly competitive, and he expected the same of his teammates. He possessed rare leadership and game-planning skills, and played with great enthusiasm even in his later years. "Tittle has the attitude of a high school kid, with the brain of a computer," said Giants teammate Frank Gifford. Baltimore Colts halfback Lenny Moore, when asked in 1963 to compare Tittle and Colts quarterback Johnny Unitas, said:  I played with Tittle in the Pro Bowl two years ago, and I discovered he's quite a guy ... He and John, however, are entirely different types ... Tittle is a sort of 'con man' with his players ... he comes into a huddle and 'suggests' that maybe this or that will work on account of something he saw happen on a previous play ... The way he puts it, you're convinced it's a good idea and maybe it will work. John, now, he's a take-charge guy ... He tells you what the other guy's going to do, what he's going to do, and what he wants you to do.  Tittle's most productive years came when he was well beyond his athletic prime. On his ability to improve with age, he credited a feel for the game that came from his years of experience in the league. "If you could learn it by studying movies, a good smart college quarterback could learn all you've got to learn in three weeks and then come in and be as good as the old heads," he told Sports Illustrated in 1963. "But they can't."
Question: what was his biggest accomplishment?
Answer: It was because of his quick release and ability to read defenses that he became one of the best screen passers in the NFL.

Problem: Background: Guy Carleton, 1st Baron Dorchester, KB (3 September 1724 - 10 November 1808), known between 1776 and 1786 as Sir Guy Carleton, was an Anglo-Irish soldier and administrator. He twice served as Governor of the Province of Quebec, from 1768 to 1778, concurrently serving as Governor General of British North America in that time, and again from 1785 to 1795. The title Baron Dorchester was created on 21 August 1786. He commanded British troops in the American War of Independence, first leading the defence of Quebec during the 1775 rebel invasion and the 1776 counteroffensive that drove the rebels from the province.
Context: In August 1783, Carleton was informed that Great Britain would grant the United States its independence. With his exit from New York imminent, Carleton asked to be relieved of his command. With this news, Loyalists began an exodus from the Thirteen Colonies and Carleton did his best to have them resettled outside the United States.  At a meeting with George Washington, among others, to arrange for the implementation of those parts of the Treaty of Paris relating to the evacuation of New York City, then commanded by Carleton and still occupied by the British Army, many Loyalists and former slaves, Carleton refused to deliver over the human property to the Americans at the time of the British evacuation. Instead, he proposed a registry so that "the owners might eventually be paid for the slaves who were entitled to their freedom by British Proclamation and promises."  Sir Guy noted that nothing could be changed in any Articles that were inconsistent with prior policies or National Honour. He added that the only mode was to pay for the Negroes, in which case justice was done to all, the former slaves and the owners. Carleton said that it would be a breach of faith not to honour the British policy of liberty to the Negro and declared that if removing them proved to be an infraction of the treaty, then compensation would have to be paid by the British government. To provide for such a contingency, he had a register kept of all Negroes who left, called the Book of Negroes, entering their names, ages, occupations, and names of their former masters. The Americans agreed to this, but as far as can be determined, the Crown never paid compensation. The British transported about 3,000 freedmen and other Loyalists to Nova Scotia for resettlement. As the colony struggled, some of the freedmen later chose in the early 1790s to go to Freetown, Sierra Leone, where the British set up a new colony, which included the Black Poor from London.  Washington disagreed with Sir Guy's actions and wrote: "...the measure is totally different from the letter and spirit of the Treaty but waiving the specialty of the point, leaving this decision to our respective Sovereigns I find it my duty to signify my readiness in conjunction with you to enter into agreements, or take any measures which may be deemed expedient to prevent the future carrying away any Negroes or other property of the American people."  On 28 November, the evacuation was finished, and Carleton returned to England. John Campbell of Strachur succeeded him as Commander-in-Chief, North America, although the post was then much reduced in scope.
Question: what did he do in that role?
Answer:
Carleton refused to deliver over the human property to the Americans at the time of the British evacuation.