What significant action did the warrior who led the attack on St. Peter Chanel take after his martyrdom?

The significant action taken by the warrior who led the attack on St. Peter Chanel, after the martyrdom of St. Peter, was that he became a Christian. This transformation is particularly important as it illustrates the profound impact that St. Peter Chanel's faith and martyrdom had on others, including those who were initially opposed to him. The conversion of the warrior signifies a turning point, showing how the message of Christianity can penetrate even the hearts of those who may have been hostile. This reflects the overarching theme of redemption and the powerful influence of faith in transforming lives, which is central to many Christian teachings.

The other options do not align with historical accounts of St. Peter Chanel's legacy and the aftermath of his martyrdom, as there are no records suggesting that the warrior engaged in those actions post-martyrdom. The focus is on the conversion and widespread message of faith rather than dispersing apostles, rebuilding churches, or writing books.