It is for good reason that artillery is known as the 'king of battle'. In World War II the United States made good use of self-propelled howitzers, including those based on the chassis of the M4 Sherman tank. After 1945 the US developed both light and medium self-propelled howitzers, based on the M24 Chaffee, M41 Walker Bulldog and Sherman chassis. The first designs were plagued with problems and self-propelled artillery played only a minor role in the Korean War. By the mid 1960s, however, the M107 175mm, M109 155mm and M110 203mms self-propelled howitzers had entered service, and they proved their effectiveness during the Vietnam War. The M107 was relatively short-lived in US service, being retired in the late 1970s, but it played an important role with the Israel Defence Forces. The M109 served with the US Army, as well as in many NATO armies and elsewhere, and saw action in the Middle East, in the Balkans, during the liberation of Kuwait, and in the invasion of Iraq. The M109 has now been in service for some sixty years and remains, in the guise of the M109A7, the current self-propelled howitzer of the US Army. The larger M110 203mm self-propelled howitzer similarly saw widespread service before it was retired in the early 1990s. Despite the emergence of rocket artillery, such as the Multiple Launch Rocket System, the self-propelled howitzer will remain one of the principal weapons systems of US military in the decades to come. The M107, M109 and M110 have proved popular subjects among modellers with a variety of kits available from the major manufacturers. As well as describing in detail the technical development and operational history of these guns, this book gives a full account of the wide range of modelling kits and accessories available in all the popular scales. Included is a modelling gallery which covers a range of variants and a section of large-scale colour profiles which provide both information and inspiration for modellers and military enthusiasts alike.