Hi everyone ! I am new to this forum and this is my first post. So, bare with me. I was reading a book called Angel Eyes by Shannon Dittermore and I came across a line I can't understand. Here it is -

"He sees the enemy. Oh yes, he sees them. But he sees their forces surrounded. He sees an angelic army. Great winged men with swords of light and halos of gold. He sees them lining the mountains that hem together this canyon. He sees horses emerging from fiery skies and chariots with wheels of sunset cloud. He sees riders with bows drawn and arrows of flame fixed on their adversaries."

Particularly I can't the understand the meaning of "sunset cloud" here.
Please explain it to me. Have a nice day !