What happened on that day in 1986?
1985 – Members of the Revolutionary Party of Central American Workers, dressed as Salvadoran soldiers, attack the Zona Rosa area of San Salvador.
This must be it:
https://revcom.us/a/1204/dayofhero.htm
Peruvian revolutionary prisoners fought back against a vicious land, sea, and air assault by the U.S.-backed Peruvian government. Over 300 revolutionary prisoners lost their lives in heroic resistance at the El Frontón, Lurigancho and Santa Barbara prisons.