Alejandro de Quesada is a Florida-based military history writer, an experienced researcher, and collector of militaria, photos and documents. He runs an archive and historical consultancy for museums and films as a secondary business. Alejandro has written over 100 articles and over 25 books, including several for Osprey, and is a leading authority on Latin American subjects.

He is the author of the following Osprey titles to date: The Spanish-American War and Philippine Insurrection, The US Home Front 1941-45, Roosevelt's Rough Riders, The Bay of Pigs, The Mexican Revolution, The United States Coast Guard during World War II, Spanish Colonial Fortifications in North America.

The Spanish Civil War was the curtainraiser to World War II and involved a complex collection of forces, particularly on the Republican side. This title illustrates how diverse the Republican forces were, drawn from loyal elements of the Spanish army that rejected the appeal of the rebel generals, a wide range of volunteer regional units and political militias, and supported by volunteers from many other countries, including Great Britain, France and Germany, in units known as the International Brigades. The wide range of equipment and uniforms worn by these troops is revealed, as is, the organization of militias into conventional brigades and divisions. Featuring specially commissioned full-colour artwork, this second part of a two-part study depicts the fighting men of the Republican forces and examples of their foreign comrades.