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In his first Tour De France in 1909, he abandoned early due to wintery conditions during the month of July, but not before
he managed a Stage 2 second place behind Tour winner Francois Faber. The following year he went head-to-head with Alcyon teammate Faber who led comfortably until colliding with a dog at the foot of the Pyrenees. Lapize finally won by just 4 points helped by a number of punctures to Faber's bike on the final stage from Caen to Paris. In a total of six starts in the Tour De France between 1909 and 1914, this victory was the only one he finished.
While climbing the Col d'Aubsique (via the Col du Soulor and the Col de Tortes) in the 1910 Tour de France he is reported to have said to the race organisers: "Vous êtes des criminels !"' (French for 'You are criminals!')" Later, at the stage finish in Bayonne, he is reported to have told a reporter that "Desgrange est un assassin" (French for 'Desgrange is a murderer!") The stage in question was 326 kilometers in length and featured the climbs of the Col de Peyresourde, Col d'Aspin, Col du Tourmalet, Col du Soulor, Col de Tortes and the Col d'Aubisque. Lapize won the stage.
The First World War ended his cycling career. As a fighter pilot in the French army, Octave Lapize was shot down near Flirey, Meurthe-et-Moselle on 14 July 1917. Fatally wounded, he died in a hospital in Toul.