Abstract: Bows and crossbows having two limbs, of which at least one limb (4a, 4c or 36a) can elastically deform by deflection or simultaneous deflection and bending thanks to the synergy of the draw on the string (10) and on auxiliary cables (7) secured at the ends (4ad, 4cd or 36ad) of the limbs (4a, 4c or 36a) and to anchors (8, 41) on the heads of the riser (1) or the stock (33).