Armstrong was a radical activist, socialist and labour advocate even before the 1919
General Strike. During the
First World War, she advocated on behalf of interned "aliens" (immigrants) and those deemed to be enemies for opposing the conscription. She also lobbied the government for increased pensions for soldiers' wives and children. She and her husband were imprisoned many times for their activism. In 1917, she was active in the
Women's Labour League, which helped in "union organization, political advocacy, the education of women workers on…their own rights." She had a strong belief in the equality of men and women and was adamant about empowering women to fight for themselves. She stated in a letter to the editor of
The Telegram in 1917: "Girls have got to learn to fight as men have had to do for the right to live, and we women of the Labor League are spending all our spare time in trying to get girls to organize as the master class have done to protect their own interests." In 1918, she was a leader in the "campaign for minimum-wage legislation for women in
Manitoba." ==Winnipeg General Strike==