Battle of Hamburger Hill "chewed up like a hamburger" in grim reference to the Battle of Pork Chop Hill during the Korean War. The battle on Hamburger Hill occurred in May 1969, during Operation Apache Snow, the second part of a three-phased campaign intended to destroy PAVN Base Areas in the remote A Sầu Valley. This campaign was a series of operations intended to do damage to the PAVN forces in the A Sầu Valley, which had been an infiltration route into South Vietnam prior to 1966, when the PAVN seized the Special Forces camp in the valley during the Battle of A Shau
Battle of Catirai fortress on a hill in the area in a difficult position on steep wooded slopes. Despite the warnings of Lorenzo Bernal del Mercado who had reconnoitered the position, Spaniards new to Chile and the Arauco War prevailed on Governor Saravia to order Martín Ruiz de Gamboa to take his command and attack the place. Meanwhile, Llanganabal had gathered all his army there at their fortress to resist the attack. Gamboa's force was badly defeated while attempting to attack up the steep thickly wooded hill into Llanganabal's fortified position. Battle of Catirai The Battle of Catirai took place on January 7,