'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

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