Question: What is the first name of the person who wrote a letter to Lieutenant Colonel L'Estrange?  Answer the above question based on the context below:  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...
Answer:
William