May 12

1865  Col Thomas Moonlight's expedition of the recently arrived 11th Kansas Cavalry reaches the Wind River in Wyoming, but fails to encounter the Cheyenne who were raiding west of Ft. Laramie that he was searching for.

1920  The Wyoming National Guard was reconstituted as the First Regiment, Wyoming Cavalry.

1922  A spring blizzard hit northeastern Wyoming.  Attribution:  On This Day.

2021   Wyoming Congressman Liz Cheney was removed from her number 3 spot in the Republican Congressional leadership over her refusal to accent to House Republican demands that she ignore or deny the role former President Donald Trump had in the January 2021 insurrection in Washington D.C.