On 29 November 1836, Clarke headed west from Port Phillip with a large flock of sheep, arriving in the Bacchus Marsh district a few days later. He built a hut on the west bank of the Lerderderg River near Darley, and lived there until early 1838. According to pastoralist George Russell, Clarke had acted on information obtained from Mr Aitken, an Edinburgh man, who was most put out when he discovered that Clarke had beaten him to the Pentland Hills run.