Career
In addition to his long legal career in Rochester, he represented his city in both houses of the state legislature. Armstrong was born to Irish immigrants in Rochester, New York, but while an infant his family moved to Albion, New York where he attended public schools and spent his young adulthood. His formal education was ended in 1880 when he started work to help his family after his father became blind.
But he continued study and was admitted to the bar early in 1888.
During his second term, he caused quite a row and made his reputation for honesty. While speaking against a bill wanted by the Insurance companies and the state commission, he read aloud into the record a note he had been handed from Senator J. Irving Burns that it could be made worth his while to drop his opposition.
In 1898, Armstrong was elected to the state Senate while Burns was defeated.