The nation slowly rose from the 'ashes' of war. = It slowly rose out of the 'ashes' and began to rebuild itself.
The city was reduced to 'ashes' by the fire. = The city was burned to 'ashes'.
Their happiness turned to 'ashes'. [=their happiness was destroyed]
(..) ...on the highways of Valhalla. V! V! V! V! I AM YOUR REDEEMER! It is by my hand... ... you will rise from the ashes... ... of this world! It's coming. Get ready. Yes. Yes. The water comes. Do not, my friends... ...become addicted to water. (..)2015 Mad Max: Fury Road