Conversation so far:
What are the Silent Sentinels?
The Silent Sentinels were a group of women in favor of women's suffrage organized by Alice Paul and the National Woman's Party.
Did they Silent Sentinels gain the right to vote?
The favor of women's suffrage was officially ratified on August 26, 1920, shortly after ratification by Tennessee, the thirty-sixth state to do so.

Question: what was her biggest accomplishment?
Self-contained rewrite: What was Alice Paul's biggest accomplishment?