Editor's note: Isobel Coleman is the author of "Paradise Beneath Her Feet" and a senior fellow for U.S. foreign policy at the Council on Foreign Relations in New York.
(CNN) -- The Egyptian revolution has a new, and shocking, image: It's the Egyptian flag, but the eagle in the middle has been replaced by a simple blue bra. The image refers to the recent, savage beating of an abaya-clad female protester by Egyptian military forces.
Graphic videos of the beating, captured on phones and uploaded to YouTube and Facebook, have quickly proliferated. They show a limp woman being dragged by her arms along the street. Her abaya is ripped open, exposing her naked torso and blue bra. Security forces surround her, many wielding batons. As the beating progresses, the guards hit her and one even stomps on her. Photos of the man bringing his heavy boot down on her bare stomach made the front page of newspapers around the world.
In response, thousands of women -- and men -- marched Tuesday in Cairo's Tahrir Square. Observers say it was the largest demonstration of women in Egypt in decades. Not since 1919, when women mobilized under the leadership of feminist Hoda Sha'rawi in anti-colonial demonstrations against the British have so many Egyptian women taken to the streets. (After representing Egyptian women at the International Women Suffrage Alliance in Rome in 1923, Sha'rawi returned to Cairo and very publicly removed her veil.)