| Site Name | Breelong, near Gilgandra |
| Aboriginal Place Name | |
| Language Group | |
| Colony | NSW |
| Present State/Territory | NSW |
| Police District | |
| Coordinates (imprecise to approx. 250m) | -31.737,148.749,0 |
| Date | 20 Jul 1900 |
| Attack Time | Night |
| Aboriginal People Killed | 0 |
| Aboriginal People Killed Notes | |
| Non-Aboriginal People Killed | 8 |
| Non-Aboriginal People Killed Notes | WC |
| Attacker Category | |
| Attacker Details | |
| Motive | Reprisal |
| Type Of Motive | |
| Weapons Used | Aboriginal and Torres Strait Islander, nulla nulla, tomahawk |
| Notes | |
| Narrative | At 10pm on 20 July 1900, Jimmy Governor and Jacky Underwood, slaughtered 7 members of the Mawbey family and the governess, at the Mawbey homestead at Breelong in reprisal for racist insults they made to Jimmy's wife and for non-payment of splitting wood for fencing. |
| Sources | Nepean Times, July 28, 1900; Durane & Gloucester Advertsier, July 31, 1900; Muswellbrook Chronicle,Oct 6, 1900; SMH, Nov 24, 1900; Singleton Argus,Jan 19, 1901.. (Sources PDF) |
| Corroboration Rating | *** |
