Kammala jumla mai zuwa: Harin kan Camp Massart ya faru ne a ranar 16 ga Disamba 1961 kuma ya kasance hari ne a kan Camp Massart, babban sansanin da aka kare na Katangese Gendarmerie a lokacin yakin basasa.
Rikicin Kwango. Harin ya kasance wani ɓangare na Operation "Unokat" wanda ke da nufin karya shingen da 'yan sanda suka kafa a ƙarshen Nuwamba 1961 kuma a lokaci guda ya dakatar da adawa da Shugaban Katangese Moïse Tshombe ga Majalisar Dinkin Duniya. A cikin wani hadadden hari, sojojin Sweden sun kama sansanin Massart; Sojojin Irish sun kai hari kan ramin jirgin kasa; tawagar Indiya ta kirkiro hare-haren karkatarwa kuma ta toshe sojojin Katangese da ke tserewa; kuma sojojin Habasha sun amintar da yammacin birnin. Harin kan sansanin Massart ya fara ne da sanyin safiyar ranar 16 ga Disamba kuma ya ƙare da misalin karfe 1 na yamma lokacin da 'yan Sweden suka kama sansanin. Tsakanin 'yan sanda 10 zuwa 20 aka kashe a harin. Sojan Sweden daya ya mutu kuma biyar sun ji rauni.