Battle of Pulang Lupa Day, observed in the Philippine province of Marinduque, is celebrated every September 13 to commemorate a significant Filipino victory during the Philippine-American War. This special non-working holiday honors the bravery and sacrifice of Filipino revolutionaries who fought against American forces. The battle took place on September 11, 1900, when U.S. Captain Devereux Shields led an infantry detachment against a guerrilla force commanded by Colonel Maximo Abad. The Americans faced a devastating defeat, with Shields ultimately surrendering after being cornered by Abad's forces. Despite the Philippines losing the war, the Battle of Pulang Lupa symbolizes Filipino resistance to American colonization. The day serves as a reminder of this important historical event and the courage displayed by those involved.