Following on this, came the occupation of the runs on the Dawson River, a tributary of the Fitzroy, and onwards to the north and far out to the great west, where the downs rolled towards the setting sun. The Fitzroy River, draining an enormous territory, equal to any river in Queensland, and surpassed by but few in Australia, was gradually and successfully occupied. Through the brigalow and mulga scrubs, dense and forbidding, over mountain ranges, stony and steep, across flooded rivers, and over or around all obstacles, the pioneers still moved on and took up and occupied runs. Westward to the Maranoa and Warrego, and northward by the Fitzroy to the Burdekin and Flinders River, and even over the South Australian borders to Port Darwin, their mission was carried on, to fill the land with the outposts of civilisation. Before 1853, the Archer family were squatting on the Burnett River, and in that year Charles and William Archer went northward on an exploring trip during which they discovered and named the Fitzroy River, and rode over the spot where now stands the city of Rockhampton, with all its wealth, civilisation, and promise of prosperity. They started from Eidsvold, on the Burnett, simply with pack horses and two men, passed from Dalgangal to Rawbelle, and at the foot of Mount Rannes found the establishment of the brothers Leith Hay, then the farthest out station. They had some very troublesome country to penetrate. Besides hilly mountainous ranges, brigalow and vine scrubs surrounded the base of Mount Spencer, whose thousand feet of height they climbed, and gave to it its name. They crossed the Dee, and passed close to the site of the famous Mount Morgan gold mine. And so on they journeyed to the top of a range, where the most astounding view lay beneath them. Through a large and apparently open valley, bounded by table-topped, pyramidal and dominant mountains, with here and there fantastically-shaped sandstone peaks, a large river wound its way towards the sea.