The Romans had a vague and contradictory geographical knowledge about Arabia Felix or Yemen. The Roman army of 10,000 men was defeated before Marib. Strabo's close relationship with Aelius Gallus led him to attempt to justify his friend's defeat in his writings. It took the Romans six months to reach Marib and 60 days to return to Egypt. The Romans blamed their Nabataean guide and executed him for treachery. No direct mention in Sabaean inscriptions of the Roman expedition has yet been found.