During the late 19th century, increasing Norwegian dissatisfaction with the union led to the demand for a return to the "pure" flag of 1821 without the union mark. Opponents of the union began to use this flag several years before it was officially recognised. During the 1890s, two consecutive sessions of the Norwegian parliament voted to abolish the mark, but the decision was overruled by royal veto. However, in 1898, when the flag law was passed for the third time, the king had to sanction it. On 12 October 1899, the union mark was removed from the Norwegian civil ensign. As the Norwegian military ensign according to the constitution of 1814 was to be a union ensign, the union mark remained on military flags until the dissolution of the union with Sweden. "Pure" military ensigns were hoisted on fortresses and naval vessels on 9 June 1905.