However, the song was perceived as a political weapon, and it was soon converted into a republican hymn. This political co-option of the theme's original meaning forced both authors to disavow this vision and stress its purely non-partisan sentiments. On 31 January 1891, a republican-inspired rebellion broke out in the northern city of Porto and "A Portuguesa" was adopted by the rebels as their marching song. The rebellion was crushed, and the song was banned. However, it was never forgotten, and, on 5 October 1910, a new and stronger rebellion developed as "A Portuguesa" played in the background. A year later, the first session of the Constituent Assembly officially proclaimed it as the national anthem.