 An illustration of this appears in the "Huolongjing", and a description of its effectiveness in obfuscating the location of the rockets from the enemy is provided.The "Huolongjing" also describes and illustrates two kinds of mounted rocket launchers that fired multiple rockets.There was a cylindrical, basket-work rocket launcher called the "Mr. Facing-both-ways rocket arrow firing basket", as well as an oblong-section, rectangular, box rocket launcher known as the "divine rocket-arrow block".