1. On October 12, 1864, the Battle of Marais des Cygnes took place in Bourbon County, Kansas during the American Civil War. Union troops under the command of General Samuel R. Curtis engaged Confederate guerrillas led by William Quantrill, resulting in over 100 casualties.

2. In 1909, the Fort Scott National Cemetery was established in Fort Scott, Kansas. The cemetery, which covers 22 acres, serves as the final resting place for over 10,000 veterans from the Civil War to modern conflicts.

3. On October 12, 1912, the first issue of The Kansas City Star newspaper was printed. The paper has since won eight Pulitzer Prizes and is known for its coverage of local and national news, as well as sports and entertainment.

4. In 1973, the Kansas City Royals played their first home game at Royals Stadium (now known as Kauffman Stadium). The team won the game 12-1 against the Texas Rangers, and went on to win the American League Western Division that season.

5. On October 12, 2015, the Kansas City Chiefs defeated the Seattle Seahawks 23-20 in a Monday Night Football game at Arrowhead Stadium. The game was notable for being the loudest outdoor stadium in the world, with crowd noise registering at over 142 decibels.