On the evening of February 4, 1899, the battalion was the first unit to skirmish with the First Nebraska Volunteer Regiment while the then-commanding officers General Artemio Ricarte and Colonel Luciano San Miguel were on leave at the time of the incident, sparking the Battle of Manila in 1899 and the Philippine–American War.
The name of the first Filipino fatality of the war was Corporal Anastacio Felix of Morong Battalion's 4th Company, under Captain Serapio Narvaez.
The battalion was reported to have retreated towards Cubao by morning of February 5 before ultimately ending up and regrouped in Marikina.
[4] Constant skirmishes and battles with the Philippine Constabulary and the U.S. Army took a heavy toll on the battalion.
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