How many times was Henry Armstrong down in his career?

Just the once, in his pro debut. Unless there's an obvious instance I'm missing.

 

Pretty sure Zivic put him down at least once if not more times.

 

"Armstrong, one of the greatest little fighting men the ring even knew, was on the floor for the final bell for the lone knockdown of the fight and had the bout lasted a minute longer the Los Angeles Negro unquestionably would have been knocked out."

Jack Cuddy (UP) Oct. 5 1940.