What effect does Wilfred Owen give to the reader by rhyming every other line in Dulce et Decorum est?

By rhyming every other line in his poem, "Dulce et Decorum est.," Wilfred Owen seems to be accentuating the creeping Horror of war. The rhythmic nature it lends to the poem also echoes the "trudge" of the men. Owen was known for his ability to honestly and gruesomely expose the reader to the hopelessness and loss he experienced in war.