"The blacks were not
numerous, but very hostile. They murdered a number of white
men and destroyed a great many cattle and horses. In May 1840,
21 of them, all armed with guns, besides their native weapons,
attacked my station in my absence. They murdered one of my
servants and burned my huts and stores, and all my wheat. Tea
was worth at that time in Melbourne 20 per chest, and flour 100
per ton. Four horses, each worth 100, were killed, and only
seven head of cattle, out of nearly 3,000, were left alive on the run.
One hundred and eighty head exclusive of those found dead were
totally lost. The rest were recovered, at such an expenditure of
money and of personal energy, as have left me an invalid for life,
and to this day comparatively a poor man."
pp187-189 George Edward Mackay to His Excellency C. J. La Trobe, Esq. in Thomas Francis Bride (ed) Letters from Victorian Pioneers Melbourne: Librarian of the Public Library Victoria, 1898
https://archive.org/stream/lettersfromvicto00publiala/lettersfromvicto00publiala_djvu.txt
This was a 3 day seige, see https://findingmerriman.com.au/merriman/timeline/merriman-holds-george-mackays-hut-in-3-days-seige/