Here warfare represents creation itself as a struggle, and finally the triumph, of order against the disorder of original Chaos. (War, moreover, is justified to the extent that it aims at eliminating a disorder and reestablishing the order demanded by the law of creation):
Thou rulest the raging of the sea [symbol of the chaotic powers]: when the waves thereof arise, thou stillest them. Thou hast broken Rahab in pieces, as one that is slain; thou hast scattered thine enemies with thy strong arm (Psalm 88, cf. Psalm 103, Isa. 51:9).
From Divine Craftsmanship by Jean Hani (28). And a little further on with more on just war (30):
War, on earth, is nothing but the reflection of the heavenly battle of Light against Darkness, of Christ against the Serpent. A christian can be sanctified through the sword in a just war.
…This means that in a war and on the earthly plane the earthly knight, the Christian soldier, occupies the place of angels, the heavenly cavalry surrounding Christ in the struggle against Evil.
Note on the Psalms quoted above: many commentators connect the cloven heads of Leviathan, Rahab and the storm waves to the cloven (and yet impressively surviving) head of the beast that comes out of the sea to join the dragon in John’s Revelation.