On May 31,2010, Israeli Defense Forces raided the ship Mavi Marmara, part of a six-vessel flotilla aiming to break the Israeli naval blockade of the Gaza Strip and to deliver supplies to Gaza. Using comments posted on Turkish online discussion forums in the aftermath of the raid that resulted in the death of nine passengers, this article analyzes how the incident was appropriated to negotiate between Turkishness and Islam as two alternative, yet coinciding forms of collective identity. Particularly, the article will compare different discursive strategies that were utilized in “general-interest” and “Islamic-leaning” online discussion groups. A deductive thematic analysis of 585 posts in general-interest and Islamic-leaning forums found significant differences in how metaphors of the body—blood, sacrifice, and martyrdom—as well as in-group/out-group comparisons were used in order to support a territorial-based nationalism versus a religion-based identity. The analysis also discusses the rhetoric that enabled discussants in general-interest forums to negotiate the tensions between the two collective identities.