Rubuta ci gaba ga wannan sakin layi - De Gaulle ya sami wuri a St Cyr a 1909. Matsayinsa na aji ya kasance matsakaici (119th daga cikin masu shiga 221), amma ya kasance matashi kuma wannan shine ƙoƙarinsa na farko a jarrabawar. A karkashin dokar 21 ga Maris, 1905, ana buƙatar jami'an sojan da ke son yin aiki na shekara guda a cikin sahu, gami da lokaci a matsayin mai zaman kansa da kuma a matsayin NCO, kafin halartar makarantar. Saboda haka, a watan Oktoba na 1909, de Gaulle ya shiga (na tsawon shekaru hudu, kamar yadda ake buƙata, maimakon na al'ada na shekaru biyu don masu aikin soja) a cikin rundunar sojojin Faransa, da ke Arras. Wannan shi ne tarihin tarihi tare da Austerlitz
, Wagram, da Borodino daga cikin girmamawar yaƙi. A watan Afrilu 1910 an daukaka shi zuwa corporal. Kwamandan rundunarsa ya ƙi ya inganta shi zuwa sargeant, matsayi na yau da kullum ga wani jami'in da zai yiwu, yana mai cewa saurayi ya ji cewa babu wani abu da ya rage fiye da Constable na Faransa zai zama mai kyau a gare shi. Daga bisani ya ci gaba da zama sarkin soja a watan Satumba na 1910.