While Kansas was a rural frontier state distant from the major theaters of war and its Unionist government was never seriously threatened by Confederate military forces, several engagements did occur within its borders, as well as countless raids and skirmishes between local irregulars, including the Lawrence Massacre by pro-Confederate guerrillas under William Quantrill in August 1863. Later the state witnessed the defeat of Confederate General Sterling Price by Union General Alfred Pleasonton at the Battle of Mine Creek, the second-largest cavalry action of the war.