'The Wild Swans'

The Wild Swans is a literary fairy tale by
Hans Christian Andersen about a princess who rescues
her eleven brothers from a spell cast by an evil queen. The
tale was first published on 2 October 1838 as the first
installment in Andersen's 'Fairy Tales Told
for Children. New Collection'. by C. A.
Reitzel in Copenhagen Denmark
link

Read the Fairy Tale here

'De vilde svaner' - 'The Wild Swans'
illustrated by the Danish artist Svend Otto S (1916-66)

I found the illustrations here