In the man he killed, the speaker is a lower-labor class and uneducated, because he use the colloquial vocabulary to finish this poem. Therefore, he doesn’t have the intellectual power to criticize the cruelty of the war. The tone is resigned and fatalism. In the whole poem, the speaker just wants to find an excuse to justify his action. Besides, the speaker’s motive is just eager to earn money so as to make up for out of work. Finally, the speaker is quaint and curious, and he doesn’t consider that why he has to killed the man. By contrast, in Dulce Et Decorum Est, the speaker is upper-class and well-educated because the speaker uses the Latin title, noble vocabulary and literature skills. The speaker is intellectual, critical and irrationality. In this poem, the tone is angry. The speaker takes advantage of imagery in order to show us the terrible war. The speaker uses the visual imagery, acoustic and taste imagery to present the scene of death such as white eye, gargling and bitter as cud. The speaker’s motive is an ideal which he believes that scarifying his life for the fatherland is a wonderful event. In the end, the speaker’s ideal is vanished into the air and disillusioned.