[1] He later took law at the University of Santo Tomas, and worked for some time as a clerk in the Court of First Instance at Binondo, but then he decided to quit the course when the Philippine Revolution broke out in August 1896.

[3] Yengko originally did not want to fight in the Revolution, as he was then finishing his law course, but one primary factor that pushed him to do so had to do with his love story.

[4] On February 13, 1897, Governor General Camilo de Polavieja opened his first phase to regain territory lost to the revolutionaries, the Cavite campaign.

General José de Lachambre, Polavieja's deputy, advanced against the revolutionaries with 16,000 men armed with Spanish M93s (also known as Mausers), and one field battery.

Yengko, along with other revolutionaries led by Aguinaldo and General Edilberto Evangelista, fought the Spanish at the Battle of Zapote Bridge.

[1] After the fall of Perez Dasmarinas to enemy control, Yengko, along with General Crispulo Aguinaldo and Colonel Juan Cailles, defended Salitran in hopes to stop the Spanish advance to Imus, the capital of the Cavite revolutionaries.