Fleming was very close to his uncle, Thomas Simpson Hall, they being of similar age and having married sisters of the same McGinnis family. Hall had been instrumental in establishing the Hall family's
Dartbrook and
Gundebri properties in the
Upper Hunter River region. In the mid-1830s, Hall with the help of Fleming, expanded his family's pastoral assets by appropriating large segments of land along the upper
Namoi River at Cuerindi and Mundowey, near the modern day town of
Manilla. In 1837, Fleming with his brother
John Henry Fleming, took up land on the
Mehi River naming their run 'Mungie Bundie'. Hall, continuing his close association with Fleming, took up a neighbouring run which he called 'Weebollabolla'. These holdings were located only a few miles from what is now the modern day town of
Moree. He soon after returned to the Hawkesbury region where he was appointed to the role of district chief constable of the police force even though his brother was still a high-profile wanted felon. He remained with the police until 1848, being the chief constable at
Wollombi and then
Molong. In 1848, Fleming again linked up with his uncle Thomas Simpson Hall to establish new pastoral interests on the frontiers of the colony. This time they drove thousands of head of cattle to the upper
Balonne River where Fleming formed the Talavera run, with Hall establishing the neighbouring runs of
Surat, Colgoon, Yamboucal and
Weribone. At Talavera, Aboriginal resistance was fierce and while establishing the run, Fleming and his men had a large battle with the local
Mandandanji people killing around fifty of them. This battle led to the name Talavera being chosen for his property, after the famous
Battle of Talavera fought during the
Peninsular War. Fleming and Hall had to maintain a private force of 12 men to fight "against native blacks". In the early 1850s, their managers on these properties, James Norman, Dick Walker and D.W. Duncomb, participated in further killings of Aboriginal people including large massacres at Yamboucal and Donga Creek where troopers of the
Native Police were utilised. By 1851, Fleming and Hall had taken possession of hundreds of thousands of acres of land along the Balonne River, from Donga Creek through to Yuleba and
Bungil Creeks. ==Steam mill at Ipswich==