Menzies was aiming for Blenheim but had been blown off course and mistook a swamp for flat pasture suitable for landing .
Menzies had left Sydney 11 hours and 45 minutes earlier .
Menzies , who had left Sydney 11 hours and 45 minutes earlier , was aiming for Blenheim but had been blown off course and mistook a swamp for flat pasture suitable for landing .