"On Wellington" is a collection of essays on the Duke of Wellington's art of war. They are a distillation of Jac Weller's understanding of the Duke developed by years of study and tramping his various battlefields. The best essays are those which summarize Wellington's use of logistics, engineers, intelligence, and irregular foces in India, Portugal and Spain. There are lessons here for the modern military professional. The essay comparing India with the Vietnam War seems forced and badly dated. The exploration of the impact of Wellington's legacy on the conduct of the Civil War is intriguing but extremely cursory. As with his other work, Jac Weller's writing style is simple and easy to understand. This book does presuppose knowledge of the Napoleonic era and of Weller's earlier work, and is therefore best read as a companion volume to Weller's trilogy on the Duke of Wellington in India, in the Iberian Peninsula, and at Waterloo.