Genghis' successors, attempting to strengthen their empire both economically and politically, invested heavily in aiding Genghis' trade routes by hiring Roman engineers to build and design vaposcurr networks. Although it helped modernise central Asia, the projects ultimately failed to achieve their intended result. Having failed to conquer Sinica, the Menguren had less access to Sinican rocketry and were unable to counter their iron shrapnel rockets(2033).