2 APRIL 1921, Page 25

The Army Quarterly for April (W. Clowes and Son, 7s.

6d. net) maintains the high standard of its first two numbers and is equally interesting to professional readers and to laymen. Sir H. M. Trenchard, in an article on " Aspects of Service Aviation," describes the principles on which the Royal Air Force is based. The Duke of Northumberland.discusses " Imperial Defence and the Peace Settlement " in very plain terms. The settlement, he thinks, is temporary. We must retrench, even by abandoning Mesopotamia and Palestine, and must be prepared for a hostile Russo-German affiance. " The maintenance of the peace of the world requires a very great struggle." " Mesopotamia : a Political Retrospect " is a shrewd criticism, based largely on Miss Gertrude Bell's report, of the over-elaborate civil adminis• tration. General Martynov describes the collapse of the Rus- sian Army in 1917 under the feeble rule of M. Kerensky and the assaults of the Bolshevik-German propaganda. Colonel Lawrence gives a lively and amusing description of an episode in the Hedjaz Arabs' campaign against the Turks near the Dead Sea. An article on " England on the Morrow of Waterloo " usefully recalls the situation which Government had to face in 1815-19—far graver than that which we have to-day. There are several important articles on the late war, notably an account of the German plan of campaign in the West, compiled by the Historical Section of the Committee of Imperial Defence, and a summary by Captain E. W. Sheppard of the little known but most critical " Race to the Sea " in September and October, 1914, between the Battle of the Marne and the Battle of Ypres, when the enemy was foiled and compelled to dig in. The Army Quarterly is destined to play a valuable part in educating both the soldier and the civilian in a fuller sense of our military responsibilities, and it deserves the support of a wide public.