Which preposition to use with mahdi

for Occurrences 1%

The Kaiser was the new Mahdi for whom men died in masses, going with fatalistic resignation to inevitable death.

of Occurrences 1%

KortiAbu Kleathe Desert Columna steamer called the Safieh not the Condor, which rescued two other steamers wrecked on their way back from a Khartoum in the red hands of the Mahdi of those days.

Which preposition to use with  mahdi