Rise like Lions after slumber
In unvanquishable number,
Shake your chains to earth like dew
Which in sleep had fallen on you
Ye are many — they are few.

Percy Bysshe Shelley (1792-1822) English poet

Poem (1819), “The Mask of Anarchy,” st. 38
    (Source)

Writing as the voice of England talking to her children. The words are repeated in the final stanza.

The poem was subtitled "Written on the Occasion of the Massacre at Manchester," referring to the Peterloo Massacre (1819-08-16), when a large, peaceful demonstration for parliamentary representation by millworkers and their families was attacked by regular and irregular cavalry troops, attempting to arrest the protest leader, Henry Hunt, and break up the assembly. Hundreds were wounded, and around a dozen killed.