The Battle of Pulang Lupa was an engagement fought on September 13, 1900, during the Philippine-American War between the forces of Colonel Maximo Abad and Devereux Shields, in which Abad's men annihilated the American force.
Abad, observing that the Americans were trying to surrender, regained control of his men before any more surrendering Americans were slaughtered, and the survivors were led away as prisoners.
After months of hiding, Abad in only a few hours eliminated nearly one third of the American garrison on Marinduque.
"The severity with which the inhabitants have been dealt would not look well if a complete history of it were written out" --Governor-General of the Philippines, William Howard Taft, concerning the U.S. Army campaign on the island of Marinduque during the Philippine-American War of 1899-1902 
On September 11, Captain Devereux Shields led a detachment of 54 29th U.S. Volunteer Infantrymen into the mountains of Torrijos to combat the elusive Abad and his guerillas. They experienced little success, except for the dispersing of 20 guerillas, in which no casualties were inflicted on either side.
Abad had excellent intelligence and was informed of Shields' movements by the local guerillas ahead of time. In response, he assembled his entire force of 250 regular Filipino soldiers and around 1,000-2,000 bolomen. The regular Philippine soldiers were well organized and reasonably well armed with bolos, pistols, and Spanish Mausers, despite the fact that most were poor shots. The bolomen, armed only with machetes or bolos, served mainly to bolster Abad's forces. Dressed as friendly farmers or civilians in the day time, they took part in guerilla activities at night. Ambushing small detachments of American soldiers, sabotage, and most importantly, supplying Abad with intelligence on American positions and movements. They had little military value however, considering they had no firearms.
The Americans lost 4 killed and 50 captured, 6 of which wounded including Shields. A large selection of American firearms were also taken by the guerillas. The Filipino losses are unknown, although Shields claimed to have inflicted 30 casualties on the Filipinos, this number was never verified.
Shields' defeat sent shock waves through the American high command. Aside from being one of the worst defeats suffered by the Americans during the war, it was especially significant given its proximity to the upcoming election between President William McKinley and his anti-imperialist opponent William Jennings Bryan, the outcome of which many believed would determine the ultimate course of the war. Consequently, the defeat triggered a sharp response.
Although Abad and most of his command had eluded the American military, the civilian population was suffering for it. Being placed into concentration camps and routine interrogation led many of the guerillas to surrender, thus decreasing the manpower and materials of the resistance.
These new tactics led to the surrender of Abad in April 1901.
in December 1898, the U.S. purchased the Philippines and other territories from Spain at the Treaty of Paris for 20 million US dollars. The US had plans to make the Philippines an American colony - which is a bit of a cheek for a nation that was and is, supposedly, against colonialism.
The people of the Philippines, who had had been fighting for their independence from Spain since 1896, rightly, had a different idea, and had already declared their independence on June 12. The US response, was to send, on August 14, 11,000 ground troops to occupy the Philippines. This was the start of The Philippine-American War and 129,000 more US troops were soon to follow. (We might ask, a century later, if the US has learned anything at all from history?)
On this day, September 13, in 1900 at Pulang Lupa, which is in Torrijos on Marinduque island in the Philippines, resistance fighters and guerrillas led by Colonel Maximo Abad inflicted a crushing defeat on a detachment of the US 29th Infantry, who were commanded by Captain Devereux Shields. The battle began when Abad and his men surrounded the infantrymen and fired a volley into the soldiers. Shields, realising that he was almost completely surrounded, ordered a retreat. But before his forces got far, Colonel Abad led a charge against the Americans. The result of the charge was a short but extremely vicious hand to hand fight, with Abad's men making use of their native machete - the bolo. The Americans took very heavy casualties, and retreated further. The guerrillas pursued and harried the Americans as they fled. The battle lasted all that day and into the early morning of the next day, when Captain Shields and his surviving men attempted to surrender en masse. But as they did, Abads men fired upon them and hacked them up with bolo knives. Many experts consider this the most bloody engagement of the war. Unfortunately, while it was undoubtedly one of only a few confidence-boosting victories for the Filipinos, it could not avert the inevitable defeat, which came, finally in 1913.
A very nasty, unnecessary and bloody war, the US lost some 4,324 American soldiers with 2,818 wounded. The Philippine Constabulary - in support of the US occupation, suffered 2,000 casualties, of which over a thousand were fatalities. In contrast, the Philippine military deaths are estimated at 20,000, while civilian deaths numbered around 1,000,000. The high casualty figures suffered by the people of the Philippines were due mostly to the superior arms and numbers of the Americans who were utterly merciless in suppressing what they viewed as an insurrection.
I wonder, if the US had not have won (since history is written by the victors), would the world have called this genocide?