FWIW.
«The first of three protest marches took place on March 7, 1965, a day known as Bloody Sunday. Led by John Lewis and the Rev. Hosea Williams, as many as 600 civil rights protesters began marching from Selma to Montgomery along U.S. Highway 80. As marchers crossed the Edmund Pettus Bridge in Selma, they were met by state troopers and armed citizens. Troopers on horseback charged the marchers, attacking them with nightsticks and tear gas. The crowd also participated in the attack [emphasis mine], leaving many marchers severely injured and some even beaten unconscious. Fifty marchers were injured and 17 were hospitalized. The brutal attack was televised across the nation, and public outrage at the violence helped the Selma voting rights campaign gain support.»
https://civilrightstrail.com/experience/marching-for-the-right-to-vote/
Here, Read This 