Strictly speaking, there is only one weapon we are to use -- the sword of the Spirit which is the Word of God. However, generally speaking, there are four facets of the Word which are weapons alongside the Word. One of those is the blood which indicates the covenant on which we are making our claims (in words). But the one with whom we are in covenant is in whose name the claims to the covenant are made therefore the backing at whose command are the forces that can enforce the legality of the claims against any objections or refusal to comply. For that reason, the full picture is the blood, the name, the Word and the Spirit (the hand or the might or the forces of God).