Mrs. Mary Ettie V. Smith claimed that "the Prophet Joseph Smith had one day broken the leg of my brother Howard, while wrestling..." (Mormonism: Its Rise, Progress, And Present Condition, page 52)
John D. Lee related that one day Joseph Smith and some of his men were wrestling. Because it was "the Sabbath day" Sidney Rigdon tried to break it up. Joseph Smith, however, "dragged him from the ring, bareheaded, and tore Rigdon's fine pulpit coat from the collar to the waist; then he turned to the men and said: 'Go in, boys, and have your fun.' " (Confessions of John D. Lee, pages 76-78)
Jedediah M. Grant, a member of the First Presidency under Brigham Young, told of "the Baptist priest who came to see Joseph Smith.... the Baptist stood before him, and folding his arms said, 'Is it possible that I now flash my optics upon a man who has conversed with my Savior?' 'Yes,' says the Prophet, 'I don't know but you do; would not you like to wrestle with me?' That, you see, brought the priest right on to the thrashing floor, and he turned a sumerset right straight. After he had whirled round a few times, like a duck shot in the head, he concluded that his piety had been awfully shocked..." (Journal of Discourses, vol. 3, pp. 66-67)
While this may have seemed funny to President Grant, Joseph Smith had a violent temper which could lead to physical violence. His close friend Benjamin F. Johnson made this observation after Smith's death:
"And yet, although so social and even convivial at times, he would allow no arrogance or undue liberties. Criticisms, even by his associates, were rarely acceptable. Contradictions would arouse in him the lion at once. By no one of his fellows would he be superseded.... one or another of his associates were more than once, for their impudence, helped from the congregation by his foot.... He soundly thrashed his brother William... While with him in such fraternal, social and sometimes convivial moods, we could not then so fully realize the greatness and majesty of his calling." (Letter by Benjamin F. Johnson to Elder George S. Gibbs, 1903, as printed in The Testimony of Joseph Smith's Best Friend, pages 4-5)
Mormon writer Max Parkin refers to a court case against Joseph Smith in which Calvin Stoddard, Joseph Smith's brother-in-law, testified that, "Smith then came up and knocked him in the forehead with his flat hand -- the blow knocked him down, when Smith repeated the blow four or five times, very hard -- made him blind -- that Smith afterwards came to him and asked his forgiveness..." (Conflict at Kirtland, citing from the Painesville Telegraph, June 26, 1835)
Parkin also quotes Luke S. Johnson, who served as an apostle in the early Mormon Church, as saying that when a minister insulted Joseph Smith at Kirtland, Ohio, Smith, " ‘boxed his ears with both hands, and turning his face towards the door, kicked him into the street,' for the man's lack of charity." (Ibid., page 268)
In the History of the Church for the year 1843, we read of two fights Joseph Smith had in Nauvoo:
"Josiah Butterfield came to my house and insulted me so outrageously that I kicked him out of the house, across the yard, and into the street." (History of the Church, vol. 5, page 316)
"Bagby called me a liar, and picked up a stone to throw at me, which so enraged me that I followed him a few steps, and struck him two or three times. Esquire Daniel H. Wells stepped between us and succeeded in separating us.... I rode down to Alderman Whitney... he imposed a fine which I paid, and then returned to the political meeting." (Ibid., page 524)
On August 13, 1843, Joseph Smith admitted that he had tried to choke Walter Bagby: "I met him, and he gave me some abusive language, taking up a stone to throw at me: I seized him by the throat to choke him off." (Ibid., page 531)
After he became president of the Mormon Church, Brigham Young commented, "if you had the Prophet Joseph to deal with, you would think that I am quite mild.... He would not bear the usage I have borne, and would appear as though he would tear down all the houses in the city, and tear up trees by the roots, if men conducted to him in the way they have to me." (Journal of Discourses, vol. 8, pp. 317-318)
"In an incident about which Smith's personal diary and official history are completely silent, he was acquitted in June 1837 of conspiring to murder anti-Mormon Grandison Newell. The silence may be due to the fact that two of Smith's supporting witnesses in the case, both apostles, acknowledged that the prophet discussed with them the possibility of killing Newell. Apostle Orson Hyde testified that 'Smith seemed much excited and declared that Newell should be put out of the way, or where the crows could not find him; he said destroying Newell would be justifiable in the sight of God, that it was the will of God, &c.' Hyde tried to be helpful by adding that he had 'never heard Smith use similar language before,'... Apostle Luke S. Johnson acknowledged to the court that Smith had said 'if Newell or any other man should head a mob against him, they ought to be put out of the way, and it would be our duty to do so.' However, Johnson also affirmed: 'I believe Smith to be a tender-hearted, humane man.' Whether or not the court agreed with that assessment, the judge acquitted Smith because there was insufficient evidence to support the charge of conspiracy to commit murder." (The Mormon Hierarchy, pages 91-92)