سُبْحَانَ ٱللَّٰهِ
Holy Qur'an
Al-Qur'an
Kids Qur'an
A metonym for "with all his strength". For what happened afterwards, see 21:58 ff.
See the reference in the last note.
With the right hand: as the right hand is the hand of power, the phrase means that he struck them with might and main and broke them.