What is associated with: by the 1300s knights were losing importance in warfare due to growing use of this explosive?

What is associated with: by sword at canterbury cathedral december 29 1170? Based on the clue 'by talking with pebbles in his mouth this ancient ...', what is the answer? Based on the clue 'by the 12th century the chinese had harnessed magn...', what is the answer? Based on the clue 'by the 12th century the chinese made one of these ...', what is the answer? Based on the clue 'by the 15th c these songs went from one voice or p...', what is the answer? Based on the clue 'by the 15th c this city was capital of the russian...', what is the answer? Based on the clue 'by the 15th century knights just werent that impor...', what is the answer? What is associated with: by the 1871 treaty of frankfurt france gave germany alsace part of this quiche making province?