"In April 1968, when Washington, D.C. was in flames following Martin Luther King, Jr.'s assassination, with a riot that injured more than 1,000 people, killed more than 13, and devastated D.C. for the next thirty years, President Johnson called in only half that number of National Guard troops to protect the nation's capital. Even during the Civil War, at the height of the fighting, there weren't 26,000 troops in D.C."
The painful symbolism of the 26,000 National Guard troops in DC
https://www.americanthinker.com/blog/2021/01/the_painful_symbolism_of_the_26000_national_guard_troops_in_dc.html