旌旗蔽日

jīngqíbìrì

Describing a vast and mighty army.

Wiktionary

Entry Composition

1 旌旗 jīngqí
  1. gonfanon
  2. banner
2 蔽日 bìrì
  1. (literary) to block out light from the sun
  2. to block out light from the sun