Mandalorian genocide

The Mandalorian genocide was carried out by the New Sith Imperium in 1,023 ABY. After over a decade of on and off infighting and occasional confrontations with the Imperium, the Sith determined that the Mandalorians were a threat to their empire and sent multiple fleets into the Mandalore sector, which the Imperium had blockade as a result of the earlier Clan Wars. The Sith carried out multiple orbital bombardments against Mandalorian worlds, reducing much of their surfaces to ash and killing billions in the process.