The present invention is directed to a crossbow operable for shooting missiles. The crossbow comprises: (a) a left-side bowhead and a right-side bowhead; (b) a left-side bow limb and a right-side bow limb; (c) a cam wheel affixed to the anterior end and the posterior end of each of the left-side and right-side bowheads and the left-side and right-side bow limbs; (d) a left-side bowhead string and a right-side bowhead string; (e) a connecting string; (f) a retention base affixed to the connecting string; and (h) a tiller capable of cocking and firing the crossbow.