Here is the map of British massacres in Australia that have written evidence (so you can double, triple the actual number). They have this right across their empire.
https://c21ch.newcastle.edu.au/colonialmassacres/map.php
If detail accounts I recommend reading "Conspiracy of Silence" a detailed account of massacres throughout colonial Queensland in Australia, the accounts and actions and just as horrifying.
https://www.goodreads.com/book/show/17674559-conspiracy-of-s...