It is the people that help or join or support the revolution during a revolutionary war. Some of the things they do are finacially supportting the amry, help them organize events, or join the war and actually fighting the war. A revolution is overthrowing a government and replaceing it with another.
"But what do we mean by the Revolution? Do we mean the war? The Revolution was effected before the war commenced. The Revolution was in the minds and hearts of the people." -John Adams
Ramon emeterio betances was one of the revolutionaries, who helped in the Puerto Rico Revouluion. He was a leader of the Grito de Lares. He gave money and hospital support to the Puerto Rican.