The incident involving Edward Vernon Sparhawk and Duff Green in 1828 was a physical assault that took place on January 25th. Sparhawk, who was working as a reporter, had been warned by Green not to repeat certain offensive actions. However, Sparhawk did so, leading Green to attack him in the rooms of the Senate Committee on Claims. This event was well-documented and captured significant attention at the time, contributing to the political tensions of the period. The details of this incident can be found on Wikipedia's page about Edward Vernon Sparhawk and in a JSTOR article titled "Duff Green, Militant Journalist of the Old School" [1][2].