To launch a crusade, you need troops equipped to deal with contemporary weaponry. You also need to pinpoint a destination. Right now, we christians are under attack in Africa, the Middle East and China.
The Hundred Swiss were created in 1480 when Louis XI retained a Swiss company for his personal guard.
After the May 13, 1981 assassination attempt on Pope John Paul II by Mehmet Ali Ağca, a much stronger emphasis has been placed on the guard's non-ceremonial roles, and has seen enhanced training in unarmed combat and small arms. Frankly, I don't think they stand a chance against the jihadists.
May St. John the Baptist protect Isalm...St. John Paul II