ABCA is not a common rhyme scheme in war poetry. ABAB, AABB, and ABCB are more commonly used.

Wilfred Owen is known for his use of slant rhyme, which is a type of rhyme in which the words do not have an exact match in sound.

Rhyme is often used in war poetry to make the poetry more memorable and easier to recite.

Anthem for Doomed Youth by Wilfred Owen uses a terza rima rhyme scheme, which is a three-line stanza with an ABA BCB CDC rhyme scheme.

Siegfried Sassoon is known for his use of internal rhyme, which is a type of rhyme in which the words rhyme within the same line of poetry.

Rhyme is often used in war poetry to emphasize the futility of war and the senselessness of death.

Do Not Go Gentle into That Good Night by Dylan Thomas uses a villanelle rhyme scheme, which is a nineteen-line poem with a specific rhyme scheme and refrain.

Isaac Rosenberg is known for his use of free verse, which is a type of poetry that does not follow a regular meter or rhyme scheme.

Free verse is often used in war poetry to create a sense of realism and to capture the chaos and brutality of war.

When You Are Old by William Butler Yeats uses a sonnet rhyme scheme, which is a fourteen-line poem with a specific rhyme scheme.

Rupert Brooke is known for his use of traditional forms of poetry, such as the sonnet and the villanelle.

Traditional forms of poetry are often used in war poetry to create a sense of beauty and to elevate the subject matter.

The Charge of the Light Brigade by Alfred, Lord Tennyson uses a ballad rhyme scheme, which is a four-line stanza with an ABAB rhyme scheme.

Isaac Rosenberg is known for his use of experimental forms of poetry, such as the free verse poem.

Experimental forms of poetry are often used in war poetry to create a sense of innovation and to challenge traditional notions of poetry.