Hamburger Hill researching the Battle of Hamburger Hill. Irvin, an English-born filmmaker, worked on several documentaries in Vietnam in 1969. Vincent Canby of "The New York Times" called "Hamburger Hill" a "well-made Vietnam War film that narrows its attention to the men of a single platoon in a specific operation." In differentiating the film from "Platoon", he noted the film "refuses to put its characters and events into any larger frame. It could have been made a week after the conclusion of the operation it recalls, which is both its strength and weakness, depending on how you look at it." Hal Hinson
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,