Ewart Alan Mackintosh's 'In Memoriam' is a collection of poems that explore the themes of war, loss, and remembrance. Mackintosh was a Scottish soldier who fought in World War I, and his poetry is deeply influenced by his experiences on the battlefield. The poems in 'In Memoriam' are often moving and elegiac, as Mackintosh mourns the loss of his comrades and reflects on the horrors of war. However, there is also a sense of hope and resilience in the poems, as Mackintosh celebrates the courage and sacrifice of those who fought and died for their country.