In virtue of the World War Adjusted Compensation Act, U.S. World War I veterans were granted certificates, or bonuses, for their service in the Armed Forces during the Great War to be redeemed in 1945. Due to the onset of the Depression, in 1932, a large group of veterans out of jobs and desperate to get some money to support their families, marched to Washington D.C. where they camped in order to request the government to honor the bonuses well ahead of their redemption date. The government refused and had U.S. Army units remove the demonstrators by the force of arms, including six tanks, resulting in two World War I veterans killed and over a thousand injured. Four years later the Congress ordered the payment of the certificates nine years before their redemption date.
European leaders responded to Islamic expansion in a very violent way. Following the initial incursions of the Islamic forces in those years, the European leaders decided it was time to take up arms and fight them in their own lands - what followed were the Crusades.
I believe its c. hope this helps...