Bissorã is a town located in the Oio Region of Guinea-Bissau. After the abrupt independence from Portugal in 1974 due to the Lisbon's Carnation Revolution, many of the Guinean black soldiers that served in the Portuguese Army and who had fought against the independence guerrillas were disarmed and left behind.
Several thousands of them were executed by the new ruling power of Guinea-Bissau, the PAICG. A small number had managed to emigrate previously to Portugal or to other African nations. The most famous massacre occurred in Bissorã. In 1980 PAIGC admitted in its newspaper "Nó Pintcha" (dated 29 November 1980) that many were executed and buried in unmarked collective graves in the woods of Cumerá, Portogole and Mansabá.