Answer: This propaganda is trying to convince you to buy war bonds.
Explanation: War bonds are a type of debt security that is issued by the government to finance military operations and other types of expenditure. The government wants you to buy war bonds so they have a strong government with plenty of artillery to make the military stronger, and not end up like Belgium. Belgium was a neutral country, so they didn't want to participate in the war. After Germany declared war on France, they would need to avoid French fortifications along the border, so German troops were ordered to cross into France through Belgium, the attack a French army further north.
