Literature in World War I is generally thought to include poems, novels and drama; diaries, letters, and memoirs are often included in this category as well. Although the canon continues to be challenged, the texts most frequently taught in schools and universities are lyrics by Siegfried Sassoon and Wilfred Owen; poems by Ivor Gurney, Edward Thomas, Charles Sorley, David Jones and Isaac Rosenberg are also widely anthologised. Many of the works during and about the war were written by men, because of the war's intense demand on the young men of that generation; however, a number of women (especially in the British tradition) created literature about the war, often observing the effects of the war on soldiers, domestic spaces, and the homefront more generally.