The Wikipedia entry about Aisha says:
Aisha's importance to revitalizing the Arab tradition and leadership among the Arab women highlights her magnitude within Islam. Aisha became involved in the politics of early Islam and the first three caliphate reigns: Abu Bakr, ‘Umar, and ‘Uthman. During a time in Islam when women were not expected, or wanted, to contribute outside the household, Aisha delivered public speeches, became directly involved in war and even battles, and helped both men and women to understand the practices of Muhammad.[additional citation needed]
The citation about Aisha delivering public speeches  refer to this book (page 51). I searched for "aisha speech" in the book but that didn't show any results.
According to John's comment, "the reference appears to be wrong."
Are there any historical accounts of Aisha (the wife of Muhammad) giving public speeches?