Attempts were made to perturb all Ottomans' radio communications to isolate and demoralize the besieged. Beginning on 24 March 1913 the external fortifications were captured in one night, and in the next night the fortress itself fell into Bulgarian hands. Early in the morning of 26 March 1913 the commander of the fortress, Mehmed Şükrü Pasha, surrendered to the Bulgarian army[10] and thus ended the siege of Odrin.