While Green’s husband Edward pursued investments as a sort of “gentleman banker”, Hetty Green began parlaying her inheritances into her own astonishing fortune. She formulated an investment strategy to which she stuck throughout her life: conservative investments, substantial cash reserves to back up any movement, and an exceedingly cool head amidst turmoil. During her time in London, most of her investment efforts focused on greenbacks, the notes printed by the U.S. government immediately after the Civil War. When more timid investors were wary of notes put forth by the still-recovering government, Hetty Green bought at full bore, claiming to have made US$1.25 million from her bond investments in one year alone. Her earnings on that front were to fund her great subsequent rail-bond purchases.