<p>From the heat and dust of the Dardanelles to the mud of the Western Front, Corporal Angus Mackay had one constant companion, his diary. He wrote of the battles and campaigns he fought in, names that would go down in history: Gallipoli, the Somme, Ypres and Arras. Serving in the 1st/5th Battalion (Queens Edinburgh Rifles) Royal Scots and later the 88th Brigade Machine Gun Corps, he left a record of one man's extraordinary and tragic war. In 'So...