Living in the trenches with other fellows and facing a huge pressure of witnessing the human losses, fatalities, great pains and sufferings of soldiers in battle zone, both Siegfried Loraine Sassoon (1886-1967) and Wilfred Edward Salter Owen (1893-1918) were drastically wounded.Death Anxiety is another concept that was taken into consideration also by Freud. However, he pointed out that individuals feel thanatophobia, fear of death. Without a doubt, Freud realised it as a mask for a profounder foundation of anxiety. According to him, as nobody is certain of his/her own expiry, therefore, individuals, in point of fact, did not fear death. As a matter of fact, because of the reality that the unconscious does not estimate the remaining amount of one’s life, passage of time or negations are not dealt with by the unconscious. In addition, no one has ever died that is why Freud assumed that the thing that we fear is not death itself. Relating it to Siegfried and Wilfred, as representatives of the so-called lost generation and as a result of their terrible trench experiences; and in connection with their life and poetry, it cannot be denied that transience, evanescence and ephemerality of happiness, youth, health, peace, tranquility and all existing beauty and even sufferings and pains in the world which are all either associated with thanatophobia or are its symptoms, have a noticeable frequency in their poems.