of immigration to the border: some to grab land and expand slavery west, others to grab land and vote down the expansion of slavery. The pro-slavery land grabbers began asymmetric violent attacks against the more pacifist abolitionists who had settled Lawrence and other territorial towns for suppressing slavery. John Brown, the abolitionist, traveled to Osawatomie in the Kansas Territory expressly to foment retaliatory attacks back against the pro-slavery guerrillas who, by 1858, had twice ransacked both Lawrence and Osawatomie (where one of Brown's sons was shot dead). The abolitionists would not return the attacks and Brown theorized that a violent spark set off on "the Border" would be a way to finally ignite his long hoped-for slave rebellion. Brown had broad-sworded slave owners at Potawatomi Creek, so the bloody civilian violence was initially symmetrical; however, once the American Civil War ignited in 1861, and when the state of Missouri voted overwhelmingly not to secede from the Union, the pro-slavers on the MO-KS border were driven either south to Arkansas and Texas, or underground—where they became guerrilla fighters and "Bushwhackers" living in the bushy ravines throughout northwest Missouri across the (now) state line from Kansas. The bloody "Border War" lasted all during the Civil War (and long after with guerrilla partisans like the James brothers cynically robbing and murdering, aided and abetted by lingering lost causers). Tragically the Western Border War was an asymmetric war: pro-slavery guerrillas and paramilitary partisans on the pro-Confederate side attacking pro-Union townspeople and commissioned Union military units; with the Union army trying to keep both in check: blocking Kansans and pro-Union Missourians from organizing militarily against the marauding Bushwhackers. The worst act of domestic terror in US history came in August 1863 when paramilitary guerrillas amassed 350 strong and rode all night 50 miles across eastern Kansas to the abolitionist stronghold of Lawrence (a political target) and destroyed the town, gunning down 150 civilians. The Confederate officer whose company had joined Quantrill's Raiders that day witnessed the civilian slaughter and forbade his soldiers from joining in the carnage. The commissioned officer refused to participate in Quantrill's asymmetric warfare on civilians. Philippine–American War The Philippine–American War (1899–1902) was an armed conflict between the United States and Filipino revolutionaries. Estimates of the Filipino forces vary between 100,000 and 1,000,000, with tens of thousands of auxiliaries. Lack of weapons and ammunition was a significant impediment to the Filipinos, so