Traveling throughout France he created networks of resistance, and organized the sabotage of the enemy's telecommunications (the plans Potard and Violet—the latter involved cutting telephone cables before D-Day[3][4]). In addition, he managed to procure the codebooks of the three secret codes used by Joseph Darnand and the Milice and used them to decipher copies of telegrams obtained from the central telegraph office in Paris. The deciphered texts were then passed on to Allied intelligence.[3]