The name Khaibar mentioned in battle cry was the last Jewish village defeated by Muhammad's army in 628. The battle marked the end of Jewish presence in Arabia. There are Muslims who see that as a precursor for future wars against Jews. At gatherings and rallies of extremists, this chant is often heard as a threat to Jews to expect to be defeated and killed again by Muslims.
The following is the transcript from Al-Jazeera TV: Reporter: "Despite the Israeli threats and several unexpected delays, the arrival of the ships at the meeting point before sailing to the Gaza Strip inflamed the emotions and the enthusiasm of the participants." Visuals from Gaza flotilla ship of young Muslims shouting Islamic battle chant invoking the killing and defeat of Jews in battle: "[Remember] Khaibar, Khaibar, oh Jews! The army of Muhammad will return!" [Khaibar is the name of last Jewish village defeated by Muhammad's army and it marked the end of Jewish presence in Arabia in 628.] Reporter: "While singing songs reminiscent of the Palestinian Intifada (Palestinian terror war against Israel, 2000 - 2005), participants expressed their longing to reach Gaza." A participant: "Right now we face one of two happy endings: either Martyrdom or reaching Gaza." [Based on Islamic call before battle: "Either victory or Martyrdom".] [Al-Jazeera TV, May 29, 2010]