| Site Name | Break O'Day Plains |
| Aboriginal Place Name | |
| Language Group | Oyster Bay |
| Colony | VDL |
| Present State/Territory | TAS |
| Police District | Waterloo Point |
| Latitude | -42.348 |
| Longitude | 147.7 |
| Date | Between 1 Jan 1829 and 31 Jan 1829 |
| Attack Time | night |
| Victims | Aboriginal People |
| Victims Killed | 10 |
| Victims Killed Notes | Killed: M 10 unspecified, F; Probable: M F; Possible: M F; Wounded: M F |
| Attackers | Colonisers: soldiers, field police,settlers, stock-keepers |
| Attackers Killed | 0 |
| Attackers Killed Notes | Killed: M F; Wounded: M F |
| Transport | Foot |
| Motive | Reprisal |
| Weapons Used | Firearms, muskets, blades, bayonets |
| Narrative | After robberies allegedly commited by Aborigines on various farms (including an attack on John Allen's farm), roving and military parties set out in pursuit. Ten Aborgines were shot and two taken near the Eastern Marshes. Carried out by a detachment of the 40th Regiment, a party of thirty colonists – comprising constables, soldiers, and neighbours, the master of one of the slain stockkeepers, John Radford and James Gumm. |
| Sources | LA February 9 - https://trove.nla.gov.au/newspaper/page/8721080, 1829. (Sources PDF) |
| Corroboration Rating | * |
