OCTOBER 27
October 27, 1941: Units of 11.Armee (von Manstein) force a breakthrough at Perekop, thus opening the gate to the Crimean peninsula.
October 27, 1942: At El Alamein, a counter-attack by 21.Panzer-Division to push the attacking British forces back into the German minefields fails, leaving the Afrikakorps with all of 81 operational tanks.
source:
http://www.feldgrau.com/october.html
27 October 1950 Chinese enter the Korean War. Having secretly moved at least 180,000 men into North Korea, Chinese forces began attacking south, surprising UN Command.
source:
http://www.awm.gov.au/atwar/thismonth/index.asp