De Gaulle's unit gained recognition for repeatedly crawling out into no man's land to listen to the conversations of the enemy in their trenches, and the information brought back was so valuable that on 18 January 1915 he received the Croix de Guerre. On 10 February he was promoted to captain, initially on probation. On 10 March 1915, de Gaulle received a bullet in the left hand, which initially seemed trivial but became infected. The wound incapacitated him for four months and later forced him to wear his wedding ring on the right hand. In August he commanded the 10th company before returning to duty as regimental adjutant. On 3 September 1915 his rank of captain became permanent. In late October, returning from leave, he returned to command of 10th company again.