Which preposition to use with indoctrination

in Occurrences 1%

When the habit of attending a chapel was pretty well confirmed, the building was surrounded, the young and stout ones were seized and branded, and carried away, with the most attractive females, for further indoctrination in the Christian arts.

of Occurrences 1%

The indoctrination of the colored people, to be sure, was still an important concern to their teachers, but the accession to their ranks of a militant secular element caused the emphasis to shift to other phases of education.

Which preposition to use with  indoctrination