sentences:  In November, Dr Alexander Collie and Lieutenant William Preston and crew from piloted two whaleboats out of Cockburn Sound and at midday on 17 November 1829 crossed the ocean bar at present day Mandurah.After camping overnight, they sailed south down the Peel-Harvey Estuary to the southern extreme near the delta of the Harvey River, where they had an amicable encounter with some local Aboriginal people.Due to strong winds, they sailed north out of the estuary without exploring the Eastern shore where the Murray River enters the estuary.