Task: Question Answering
Input (English): Passage: William Hulton, the chairman of the magistrates watching from the house on the edge of St Peter's Field, saw the enthusiastic reception that Hunt received on his arrival at the assembly, and it encouraged him to action. He issued an arrest warrant for Henry Hunt, Joseph Johnson, John Knight, and James Moorhouse. On being handed the warrant the Constable, Jonathan Andrews, offered his opinion that the press of the crowd surrounding the hustings would make military assistance necessary for its execution. Hulton then wrote two letters, one to Major Thomas Trafford, the commanding officer of the Manchester and Salford Yeomanry Cavalry, and the other to the overall military commander in Manchester, Lieutenant Colonel Guy L'Estrange. The contents of both notes were similar:
Sir, as chairman of the select committee of magistrates, I request you to proceed immediately to no. 6 Mount Street, where the magistrates are assembled. They consider the Civil Power wholly inadequate to preserve the peace. I have the honour, & c. Wm. Hulton.
The notes were handed to two horsemen who were standing by. The Manchester and Salford Yeomanry were stationed just a short distance away in Portland Street, and so received their note first. They immediately drew their swords and galloped towards St Peter's Field. One trooper, in a frantic attempt to catch up, knocked down a woman in Cooper Street, causing the death of her son when he was thrown from her arms; two-year-old William Fildes was the first casualty of Peterloo.Sixty cavalrymen of the Manchester and Salford Yeomanry, led by Captain Hugh Hornby Birley, a local factory owner, arrived at the house from where the magistrates were watching; some reports allege that they were drunk. Andrews, the Chief Constable, instructed Birley that he had an arrest warrant which he needed assistance to execute. Birley was asked to take his cavalry to the hustings to allow the speakers to be removed; it was by then about 1:40 pm.
The route towards the hustings between the special constables was narrow, and as the inexperienced horses were thrust further and further into the crowd they reared and plunged as people tried to get out of their way. The arrest warrant had been given to the Deputy Constable, Joseph Nadin, who followed behind the yeomanry. As the cavalry pushed towards the speakers' stand they became stuck in the crowd, and in panic started to hack about them with their sabres. On his arrival at the stand Nadin arrested Hunt, Johnson and a number of others including John Tyas, the reporter from The Times. Their mission to execute the arrest warrant having been achieved, the yeomanry set about destroying the banners and flags on the stand. According to Tyas, the yeomanry then attempted to reach flags in the crowd "cutting most indiscriminately to the right and to the left to get at them" – only then (said Tyas) were brickbats thrown at the military: "From this point the Manchester and Salford Yeomanry lost all command of temper". 
Question: What is the first name of the person who wrote a letter to Lieutenant Colonel L'Estrange?
Output (English): William.