What was the "Bonus Army "and why did they protest?

Bonus Army. Bonus Army marchers (left) confront the police. The Bonus Army was a group of 43,000 demonstrators - made up of 17,000 U. S. World War I veterans, together with their families and affiliated groups - who gathered in Washington, D. C. in mid-1932 to demand early cash redemption of their service certificates.