Can you elaborate on the descent of the 'Yavana' armies and the fading of power in the Deccan as mentioned in the text?

The source text provides very limited information on this historical event. Chapter 2 mentions it in the context of historical figures like the scholar Bopadev and the statesman Hemadpant. The text simply states, 'From there onwards, the "Yavana" (Muslim) armies descended from the North. Everywhere was Muslim rule, and the power in the South (Deccan) faded.' It does not offer any further elaboration on which specific armies were involved, the timeline of these events, or the detailed consequences of their rule beyond this general statement about the shift in power.