From their introduction in 1940, the German army's Sturmgeschütz assault guns played a vital role in the campaigns of the Blitzkrieg era, the gargantuan struggles in Russia and the final defensive battles. Evolving from a mobile bunker-buster, armed with a short-barrelled howitzer, the Sturmgeschütz III was up-armoured and up-gunned and by 1943 its tank killing abilities were widely recognised. In 1944, largely as an emergency quick-fix, the Sturmgeschütz IV entered service and over 10,000 examples of both versions had been built by the end of the war. Although not as well known as the Tiger or Panther tanks, they were among the most frequently encountered German armoured vehicles and as the Wehrmacht's resources continued to decline, the assault guns were thrown into every operation and increasingly substituted for gun tanks in official unit establishments. In the second volume in the TankCraft series to examine the Sturmgeschütz, Dennis Oliver employs official documentation and unit histories to investigate the formations that operated these vehicles and uses archive photos and extensively researched colour illustrations to examine the markings, camouflage and technical aspects of the Sturmgeschütz III and Sturmgeschütz IV that served on the Eastern Fronts during what was almost certainly the pivotal year of the campaign. A key section of his book displays available model kits and aftermarket products, complemented by a gallery of beautifully constructed and painted models in various scales. Technical details as well as modifications introduced during production and in the field are also examined, providing everything the modeller needs to recreate an accurate representation of these historic vehicles.