Final answer:
During the French Revolution, having an army was seen as necessary for defending the revolutionary ideas, gaining ground on the battlefield, and ensuring the security of the nation.
Step-by-step explanation:
During the French Revolution, there were several arguments in favor of having an army. Firstly, the elimination of noble privilege allowed the French government to impose conscription and increase the size and flexibility of its armies. This enabled them to defend the revolutionary ideas and gain ground on the battlefield. Additionally, having a well-trained army with professional officers was seen as crucial for the defense and security of the nation, especially in the face of foreign threats.